Recreate ctr-std from latest nightly

1 files changed, 1835 insertions, 0 deletions

diff --git a/ctr-std/src/net/ip.rs b/ctr-std/src/net/ip.rs
new file mode 100644
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+++ b/ctr-std/src/net/ip.rs
@@ -0,0 +1,1835 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![unstable(feature = "ip", reason = "extra functionality has not been \
+                                      scrutinized to the level that it should \
+                                      be to be stable",
+            issue = "27709")]
+
+use cmp::Ordering;
+use fmt;
+use hash;
+use mem;
+use net::{hton, ntoh};
+use sys::net::netc as c;
+use sys_common::{AsInner, FromInner};
+
+/// An IP address, either IPv4 or IPv6.
+///
+/// This enum can contain either an [`Ipv4Addr`] or an [`Ipv6Addr`], see their
+/// respective documentation for more details.
+///
+/// [`Ipv4Addr`]: ../../std/net/struct.Ipv4Addr.html
+/// [`Ipv6Addr`]: ../../std/net/struct.Ipv6Addr.html
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+///
+/// let localhost_v4 = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
+/// let localhost_v6 = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+///
+/// assert_eq!("127.0.0.1".parse(), Ok(localhost_v4));
+/// assert_eq!("::1".parse(), Ok(localhost_v6));
+///
+/// assert_eq!(localhost_v4.is_ipv6(), false);
+/// assert_eq!(localhost_v4.is_ipv4(), true);
+/// ```
+#[stable(feature = "ip_addr", since = "1.7.0")]
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash, PartialOrd, Ord)]
+pub enum IpAddr {
+    /// An IPv4 address.
+    #[stable(feature = "ip_addr", since = "1.7.0")]
+    V4(#[stable(feature = "ip_addr", since = "1.7.0")] Ipv4Addr),
+    /// An IPv6 address.
+    #[stable(feature = "ip_addr", since = "1.7.0")]
+    V6(#[stable(feature = "ip_addr", since = "1.7.0")] Ipv6Addr),
+}
+
+/// An IPv4 address.
+///
+/// IPv4 addresses are defined as 32-bit integers in [IETF RFC 791].
+/// They are usually represented as four octets.
+///
+/// See [`IpAddr`] for a type encompassing both IPv4 and IPv6 addresses.
+///
+/// [IETF RFC 791]: https://tools.ietf.org/html/rfc791
+/// [`IpAddr`]: ../../std/net/enum.IpAddr.html
+///
+/// # Textual representation
+///
+/// `Ipv4Addr` provides a [`FromStr`] implementation. The four octets are in decimal
+/// notation, divided by `.` (this is called "dot-decimal notation").
+///
+/// [`FromStr`]: ../../std/str/trait.FromStr.html
+///
+/// # Examples
+///
+/// ```
+/// use std::net::Ipv4Addr;
+///
+/// let localhost = Ipv4Addr::new(127, 0, 0, 1);
+/// assert_eq!("127.0.0.1".parse(), Ok(localhost));
+/// assert_eq!(localhost.is_loopback(), true);
+/// ```
+#[derive(Copy)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Ipv4Addr {
+    inner: c::in_addr,
+}
+
+/// An IPv6 address.
+///
+/// IPv6 addresses are defined as 128-bit integers in [IETF RFC 4291].
+/// They are usually represented as eight 16-bit segments.
+///
+/// See [`IpAddr`] for a type encompassing both IPv4 and IPv6 addresses.
+///
+/// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+/// [`IpAddr`]: ../../std/net/enum.IpAddr.html
+///
+/// # Textual representation
+///
+/// `Ipv6Addr` provides a [`FromStr`] implementation. There are many ways to represent
+/// an IPv6 address in text, but in general, each segments is written in hexadecimal
+/// notation, and segments are separated by `:`. For more information, see
+/// [IETF RFC 5952].
+///
+/// [`FromStr`]: ../../std/str/trait.FromStr.html
+/// [IETF RFC 5952]: https://tools.ietf.org/html/rfc5952
+///
+/// # Examples
+///
+/// ```
+/// use std::net::Ipv6Addr;
+///
+/// let localhost = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+/// assert_eq!("::1".parse(), Ok(localhost));
+/// assert_eq!(localhost.is_loopback(), true);
+/// ```
+#[derive(Copy)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Ipv6Addr {
+    inner: c::in6_addr,
+}
+
+#[allow(missing_docs)]
+#[derive(Copy, PartialEq, Eq, Clone, Hash, Debug)]
+pub enum Ipv6MulticastScope {
+    InterfaceLocal,
+    LinkLocal,
+    RealmLocal,
+    AdminLocal,
+    SiteLocal,
+    OrganizationLocal,
+    Global
+}
+
+impl IpAddr {
+    /// Returns [`true`] for the special 'unspecified' address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_unspecified`][IPv4] and
+    /// [`Ipv6Addr::is_unspecified`][IPv6] for more details.
+    ///
+    /// [IPv4]: ../../std/net/struct.Ipv4Addr.html#method.is_unspecified
+    /// [IPv6]: ../../std/net/struct.Ipv6Addr.html#method.is_unspecified
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)).is_unspecified(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)).is_unspecified(), true);
+    /// ```
+    #[stable(feature = "ip_shared", since = "1.12.0")]
+    pub fn is_unspecified(&self) -> bool {
+        match *self {
+            IpAddr::V4(ref a) => a.is_unspecified(),
+            IpAddr::V6(ref a) => a.is_unspecified(),
+        }
+    }
+
+    /// Returns [`true`] if this is a loopback address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_loopback`][IPv4] and
+    /// [`Ipv6Addr::is_loopback`][IPv6] for more details.
+    ///
+    /// [IPv4]: ../../std/net/struct.Ipv4Addr.html#method.is_loopback
+    /// [IPv6]: ../../std/net/struct.Ipv6Addr.html#method.is_loopback
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)).is_loopback(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1)).is_loopback(), true);
+    /// ```
+    #[stable(feature = "ip_shared", since = "1.12.0")]
+    pub fn is_loopback(&self) -> bool {
+        match *self {
+            IpAddr::V4(ref a) => a.is_loopback(),
+            IpAddr::V6(ref a) => a.is_loopback(),
+        }
+    }
+
+    /// Returns [`true`] if the address appears to be globally routable.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_global`][IPv4] and
+    /// [`Ipv6Addr::is_global`][IPv6] for more details.
+    ///
+    /// [IPv4]: ../../std/net/struct.Ipv4Addr.html#method.is_global
+    /// [IPv6]: ../../std/net/struct.Ipv6Addr.html#method.is_global
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// fn main() {
+    ///     assert_eq!(IpAddr::V4(Ipv4Addr::new(80, 9, 12, 3)).is_global(), true);
+    ///     assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0x1c9, 0, 0, 0xafc8, 0, 0x1)).is_global(),
+    ///                true);
+    /// }
+    /// ```
+    pub fn is_global(&self) -> bool {
+        match *self {
+            IpAddr::V4(ref a) => a.is_global(),
+            IpAddr::V6(ref a) => a.is_global(),
+        }
+    }
+
+    /// Returns [`true`] if this is a multicast address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_multicast`][IPv4] and
+    /// [`Ipv6Addr::is_multicast`][IPv6] for more details.
+    ///
+    /// [IPv4]: ../../std/net/struct.Ipv4Addr.html#method.is_multicast
+    /// [IPv6]: ../../std/net/struct.Ipv6Addr.html#method.is_multicast
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(224, 254, 0, 0)).is_multicast(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0)).is_multicast(), true);
+    /// ```
+    #[stable(feature = "ip_shared", since = "1.12.0")]
+    pub fn is_multicast(&self) -> bool {
+        match *self {
+            IpAddr::V4(ref a) => a.is_multicast(),
+            IpAddr::V6(ref a) => a.is_multicast(),
+        }
+    }
+
+    /// Returns [`true`] if this address is in a range designated for documentation.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_documentation`][IPv4] and
+    /// [`Ipv6Addr::is_documentation`][IPv6] for more details.
+    ///
+    /// [IPv4]: ../../std/net/struct.Ipv4Addr.html#method.is_documentation
+    /// [IPv6]: ../../std/net/struct.Ipv6Addr.html#method.is_documentation
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// fn main() {
+    ///     assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_documentation(), true);
+    ///     assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0))
+    ///                       .is_documentation(), true);
+    /// }
+    /// ```
+    pub fn is_documentation(&self) -> bool {
+        match *self {
+            IpAddr::V4(ref a) => a.is_documentation(),
+            IpAddr::V6(ref a) => a.is_documentation(),
+        }
+    }
+
+    /// Returns [`true`] if this address is an [IPv4 address], and [`false`] otherwise.
+    ///
+    /// [`true`]: ../../std/primitive.bool.html
+    /// [`false`]: ../../std/primitive.bool.html
+    /// [IPv4 address]: #variant.V4
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// fn main() {
+    ///     assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_ipv4(), true);
+    ///     assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_ipv4(),
+    ///                false);
+    /// }
+    /// ```
+    #[stable(feature = "ipaddr_checker", since = "1.16.0")]
+    pub fn is_ipv4(&self) -> bool {
+        match *self {
+            IpAddr::V4(_) => true,
+            IpAddr::V6(_) => false,
+        }
+    }
+
+    /// Returns [`true`] if this address is an [IPv6 address], and [`false`] otherwise.
+    ///
+    /// [`true`]: ../../std/primitive.bool.html
+    /// [`false`]: ../../std/primitive.bool.html
+    /// [IPv6 address]: #variant.V6
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// fn main() {
+    ///     assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_ipv6(), false);
+    ///     assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_ipv6(),
+    ///                true);
+    /// }
+    /// ```
+    #[stable(feature = "ipaddr_checker", since = "1.16.0")]
+    pub fn is_ipv6(&self) -> bool {
+        match *self {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(_) => true,
+        }
+    }
+}
+
+impl Ipv4Addr {
+    /// Creates a new IPv4 address from four eight-bit octets.
+    ///
+    /// The result will represent the IP address `a`.`b`.`c`.`d`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn new(a: u8, b: u8, c: u8, d: u8) -> Ipv4Addr {
+        Ipv4Addr {
+            inner: c::in_addr {
+                s_addr: hton(((a as u32) << 24) |
+                             ((b as u32) << 16) |
+                             ((c as u32) <<  8) |
+                              (d as u32)),
+            }
+        }
+    }
+
+    /// Creates a new IPv4 address with the address pointing to localhost: 127.0.0.1.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip_constructors)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::localhost();
+    /// assert_eq!(addr, Ipv4Addr::new(127, 0, 0, 1));
+    /// ```
+    #[unstable(feature = "ip_constructors",
+               reason = "requires greater scrutiny before stabilization",
+               issue = "44582")]
+    pub fn localhost() -> Ipv4Addr {
+        Ipv4Addr::new(127, 0, 0, 1)
+    }
+
+    /// Creates a new IPv4 address representing an unspecified address: 0.0.0.0
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip_constructors)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::unspecified();
+    /// assert_eq!(addr, Ipv4Addr::new(0, 0, 0, 0));
+    /// ```
+    #[unstable(feature = "ip_constructors",
+               reason = "requires greater scrutiny before stabilization",
+               issue = "44582")]
+    pub fn unspecified() -> Ipv4Addr {
+        Ipv4Addr::new(0, 0, 0, 0)
+    }
+
+    /// Returns the four eight-bit integers that make up this address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    /// assert_eq!(addr.octets(), [127, 0, 0, 1]);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn octets(&self) -> [u8; 4] {
+        let bits = ntoh(self.inner.s_addr);
+        [(bits >> 24) as u8, (bits >> 16) as u8, (bits >> 8) as u8, bits as u8]
+    }
+
+    /// Returns [`true`] for the special 'unspecified' address (0.0.0.0).
+    ///
+    /// This property is defined in _UNIX Network Programming, Second Edition_,
+    /// W. Richard Stevens, p. 891; see also [ip7].
+    ///
+    /// [ip7]: http://man7.org/linux/man-pages/man7/ip.7.html
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(0, 0, 0, 0).is_unspecified(), true);
+    /// assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_unspecified(), false);
+    /// ```
+    #[stable(feature = "ip_shared", since = "1.12.0")]
+    pub fn is_unspecified(&self) -> bool {
+        self.inner.s_addr == 0
+    }
+
+    /// Returns [`true`] if this is a loopback address (127.0.0.0/8).
+    ///
+    /// This property is defined by [IETF RFC 1122].
+    ///
+    /// [IETF RFC 1122]: https://tools.ietf.org/html/rfc1122
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(127, 0, 0, 1).is_loopback(), true);
+    /// assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_loopback(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_loopback(&self) -> bool {
+        self.octets()[0] == 127
+    }
+
+    /// Returns [`true`] if this is a private address.
+    ///
+    /// The private address ranges are defined in [IETF RFC 1918] and include:
+    ///
+    ///  - 10.0.0.0/8
+    ///  - 172.16.0.0/12
+    ///  - 192.168.0.0/16
+    ///
+    /// [IETF RFC 1918]: https://tools.ietf.org/html/rfc1918
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(10, 0, 0, 1).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(10, 10, 10, 10).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 10).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 29, 45, 14).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 32, 0, 2).is_private(), false);
+    /// assert_eq!(Ipv4Addr::new(192, 168, 0, 2).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(192, 169, 0, 2).is_private(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_private(&self) -> bool {
+        match (self.octets()[0], self.octets()[1]) {
+            (10, _) => true,
+            (172, b) if b >= 16 && b <= 31 => true,
+            (192, 168) => true,
+            _ => false
+        }
+    }
+
+    /// Returns [`true`] if the address is link-local (169.254.0.0/16).
+    ///
+    /// This property is defined by [IETF RFC 3927].
+    ///
+    /// [IETF RFC 3927]: https://tools.ietf.org/html/rfc3927
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(169, 254, 0, 0).is_link_local(), true);
+    /// assert_eq!(Ipv4Addr::new(169, 254, 10, 65).is_link_local(), true);
+    /// assert_eq!(Ipv4Addr::new(16, 89, 10, 65).is_link_local(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_link_local(&self) -> bool {
+        self.octets()[0] == 169 && self.octets()[1] == 254
+    }
+
+    /// Returns [`true`] if the address appears to be globally routable.
+    /// See [iana-ipv4-special-registry][ipv4-sr].
+    ///
+    /// The following return false:
+    ///
+    /// - private address (10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16)
+    /// - the loopback address (127.0.0.0/8)
+    /// - the link-local address (169.254.0.0/16)
+    /// - the broadcast address (255.255.255.255/32)
+    /// - test addresses used for documentation (192.0.2.0/24, 198.51.100.0/24 and 203.0.113.0/24)
+    /// - the unspecified address (0.0.0.0)
+    ///
+    /// [ipv4-sr]: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv4Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv4Addr::new(10, 254, 0, 0).is_global(), false);
+    ///     assert_eq!(Ipv4Addr::new(192, 168, 10, 65).is_global(), false);
+    ///     assert_eq!(Ipv4Addr::new(172, 16, 10, 65).is_global(), false);
+    ///     assert_eq!(Ipv4Addr::new(0, 0, 0, 0).is_global(), false);
+    ///     assert_eq!(Ipv4Addr::new(80, 9, 12, 3).is_global(), true);
+    /// }
+    /// ```
+    pub fn is_global(&self) -> bool {
+        !self.is_private() && !self.is_loopback() && !self.is_link_local() &&
+        !self.is_broadcast() && !self.is_documentation() && !self.is_unspecified()
+    }
+
+    /// Returns [`true`] if this is a multicast address (224.0.0.0/4).
+    ///
+    /// Multicast addresses have a most significant octet between 224 and 239,
+    /// and is defined by [IETF RFC 5771].
+    ///
+    /// [IETF RFC 5771]: https://tools.ietf.org/html/rfc5771
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(224, 254, 0, 0).is_multicast(), true);
+    /// assert_eq!(Ipv4Addr::new(236, 168, 10, 65).is_multicast(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 65).is_multicast(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_multicast(&self) -> bool {
+        self.octets()[0] >= 224 && self.octets()[0] <= 239
+    }
+
+    /// Returns [`true`] if this is a broadcast address (255.255.255.255).
+    ///
+    /// A broadcast address has all octets set to 255 as defined in [IETF RFC 919].
+    ///
+    /// [IETF RFC 919]: https://tools.ietf.org/html/rfc919
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_broadcast(), true);
+    /// assert_eq!(Ipv4Addr::new(236, 168, 10, 65).is_broadcast(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_broadcast(&self) -> bool {
+        self.octets()[0] == 255 && self.octets()[1] == 255 &&
+        self.octets()[2] == 255 && self.octets()[3] == 255
+    }
+
+    /// Returns [`true`] if this address is in a range designated for documentation.
+    ///
+    /// This is defined in [IETF RFC 5737]:
+    ///
+    /// - 192.0.2.0/24 (TEST-NET-1)
+    /// - 198.51.100.0/24 (TEST-NET-2)
+    /// - 203.0.113.0/24 (TEST-NET-3)
+    ///
+    /// [IETF RFC 5737]: https://tools.ietf.org/html/rfc5737
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 51, 100, 65).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(203, 0, 113, 6).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(193, 34, 17, 19).is_documentation(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_documentation(&self) -> bool {
+        match(self.octets()[0], self.octets()[1], self.octets()[2], self.octets()[3]) {
+            (192, 0, 2, _) => true,
+            (198, 51, 100, _) => true,
+            (203, 0, 113, _) => true,
+            _ => false
+        }
+    }
+
+    /// Converts this address to an IPv4-compatible [IPv6 address].
+    ///
+    /// a.b.c.d becomes ::a.b.c.d
+    ///
+    /// [IPv6 address]: ../../std/net/struct.Ipv6Addr.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).to_ipv6_compatible(),
+    ///            Ipv6Addr::new(0, 0, 0, 0, 0, 0, 49152, 767));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn to_ipv6_compatible(&self) -> Ipv6Addr {
+        Ipv6Addr::new(0, 0, 0, 0, 0, 0,
+                      ((self.octets()[0] as u16) << 8) | self.octets()[1] as u16,
+                      ((self.octets()[2] as u16) << 8) | self.octets()[3] as u16)
+    }
+
+    /// Converts this address to an IPv4-mapped [IPv6 address].
+    ///
+    /// a.b.c.d becomes ::ffff:a.b.c.d
+    ///
+    /// [IPv6 address]: ../../std/net/struct.Ipv6Addr.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).to_ipv6_mapped(),
+    ///            Ipv6Addr::new(0, 0, 0, 0, 0, 65535, 49152, 767));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn to_ipv6_mapped(&self) -> Ipv6Addr {
+        Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff,
+                      ((self.octets()[0] as u16) << 8) | self.octets()[1] as u16,
+                      ((self.octets()[2] as u16) << 8) | self.octets()[3] as u16)
+    }
+}
+
+#[stable(feature = "ip_addr", since = "1.7.0")]
+impl fmt::Display for IpAddr {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            IpAddr::V4(ref a) => a.fmt(fmt),
+            IpAddr::V6(ref a) => a.fmt(fmt),
+        }
+    }
+}
+
+#[stable(feature = "ip_from_ip", since = "1.16.0")]
+impl From<Ipv4Addr> for IpAddr {
+    fn from(ipv4: Ipv4Addr) -> IpAddr {
+        IpAddr::V4(ipv4)
+    }
+}
+
+#[stable(feature = "ip_from_ip", since = "1.16.0")]
+impl From<Ipv6Addr> for IpAddr {
+    fn from(ipv6: Ipv6Addr) -> IpAddr {
+        IpAddr::V6(ipv6)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Display for Ipv4Addr {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let octets = self.octets();
+        write!(fmt, "{}.{}.{}.{}", octets[0], octets[1], octets[2], octets[3])
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Debug for Ipv4Addr {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(self, fmt)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Clone for Ipv4Addr {
+    fn clone(&self) -> Ipv4Addr { *self }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl PartialEq for Ipv4Addr {
+    fn eq(&self, other: &Ipv4Addr) -> bool {
+        self.inner.s_addr == other.inner.s_addr
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialEq<Ipv4Addr> for IpAddr {
+    fn eq(&self, other: &Ipv4Addr) -> bool {
+        match *self {
+            IpAddr::V4(ref v4) => v4 == other,
+            IpAddr::V6(_) => false,
+        }
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialEq<IpAddr> for Ipv4Addr {
+    fn eq(&self, other: &IpAddr) -> bool {
+        match *other {
+            IpAddr::V4(ref v4) => self == v4,
+            IpAddr::V6(_) => false,
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Eq for Ipv4Addr {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl hash::Hash for Ipv4Addr {
+    fn hash<H: hash::Hasher>(&self, s: &mut H) {
+        // `inner` is #[repr(packed)], so we need to copy `s_addr`.
+        {self.inner.s_addr}.hash(s)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl PartialOrd for Ipv4Addr {
+    fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialOrd<Ipv4Addr> for IpAddr {
+    fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering> {
+        match *self {
+            IpAddr::V4(ref v4) => v4.partial_cmp(other),
+            IpAddr::V6(_) => Some(Ordering::Greater),
+        }
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialOrd<IpAddr> for Ipv4Addr {
+    fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering> {
+        match *other {
+            IpAddr::V4(ref v4) => self.partial_cmp(v4),
+            IpAddr::V6(_) => Some(Ordering::Less),
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Ord for Ipv4Addr {
+    fn cmp(&self, other: &Ipv4Addr) -> Ordering {
+        ntoh(self.inner.s_addr).cmp(&ntoh(other.inner.s_addr))
+    }
+}
+
+impl AsInner<c::in_addr> for Ipv4Addr {
+    fn as_inner(&self) -> &c::in_addr { &self.inner }
+}
+impl FromInner<c::in_addr> for Ipv4Addr {
+    fn from_inner(addr: c::in_addr) -> Ipv4Addr {
+        Ipv4Addr { inner: addr }
+    }
+}
+
+#[stable(feature = "ip_u32", since = "1.1.0")]
+impl From<Ipv4Addr> for u32 {
+    /// It performs the conversion in network order (big-endian).
+    fn from(ip: Ipv4Addr) -> u32 {
+        let ip = ip.octets();
+        ((ip[0] as u32) << 24) + ((ip[1] as u32) << 16) + ((ip[2] as u32) << 8) + (ip[3] as u32)
+    }
+}
+
+#[stable(feature = "ip_u32", since = "1.1.0")]
+impl From<u32> for Ipv4Addr {
+    /// It performs the conversion in network order (big-endian).
+    fn from(ip: u32) -> Ipv4Addr {
+        Ipv4Addr::new((ip >> 24) as u8, (ip >> 16) as u8, (ip >> 8) as u8, ip as u8)
+    }
+}
+
+#[stable(feature = "from_slice_v4", since = "1.9.0")]
+impl From<[u8; 4]> for Ipv4Addr {
+    fn from(octets: [u8; 4]) -> Ipv4Addr {
+        Ipv4Addr::new(octets[0], octets[1], octets[2], octets[3])
+    }
+}
+
+#[stable(feature = "ip_from_slice", since = "1.17.0")]
+impl From<[u8; 4]> for IpAddr {
+    fn from(octets: [u8; 4]) -> IpAddr {
+        IpAddr::V4(Ipv4Addr::from(octets))
+    }
+}
+
+impl Ipv6Addr {
+    /// Creates a new IPv6 address from eight 16-bit segments.
+    ///
+    /// The result will represent the IP address a:b:c:d:e:f:g:h.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn new(a: u16, b: u16, c: u16, d: u16, e: u16, f: u16, g: u16,
+               h: u16) -> Ipv6Addr {
+        let mut addr: c::in6_addr = unsafe { mem::zeroed() };
+        addr.s6_addr = [(a >> 8) as u8, a as u8,
+                        (b >> 8) as u8, b as u8,
+                        (c >> 8) as u8, c as u8,
+                        (d >> 8) as u8, d as u8,
+                        (e >> 8) as u8, e as u8,
+                        (f >> 8) as u8, f as u8,
+                        (g >> 8) as u8, g as u8,
+                        (h >> 8) as u8, h as u8];
+        Ipv6Addr { inner: addr }
+    }
+
+    /// Creates a new IPv6 address representing localhost: `::1`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip_constructors)]
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::localhost();
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    /// ```
+    #[unstable(feature = "ip_constructors",
+               reason = "requires greater scrutiny before stabilization",
+               issue = "44582")]
+    pub fn localhost() -> Ipv6Addr {
+        Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)
+    }
+
+    /// Creates a new IPv6 address representing the unspecified address: `::`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip_constructors)]
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::unspecified();
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+    /// ```
+    #[unstable(feature = "ip_constructors",
+               reason = "requires greater scrutiny before stabilization",
+               issue = "44582")]
+    pub fn unspecified() -> Ipv6Addr {
+        Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)
+    }
+
+    /// Returns the eight 16-bit segments that make up this address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).segments(),
+    ///            [0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff]);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn segments(&self) -> [u16; 8] {
+        let arr = &self.inner.s6_addr;
+        [
+            (arr[0] as u16) << 8 | (arr[1] as u16),
+            (arr[2] as u16) << 8 | (arr[3] as u16),
+            (arr[4] as u16) << 8 | (arr[5] as u16),
+            (arr[6] as u16) << 8 | (arr[7] as u16),
+            (arr[8] as u16) << 8 | (arr[9] as u16),
+            (arr[10] as u16) << 8 | (arr[11] as u16),
+            (arr[12] as u16) << 8 | (arr[13] as u16),
+            (arr[14] as u16) << 8 | (arr[15] as u16),
+        ]
+    }
+
+    /// Returns [`true`] for the special 'unspecified' address (::).
+    ///
+    /// This property is defined in [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unspecified(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0).is_unspecified(), true);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_unspecified(&self) -> bool {
+        self.segments() == [0, 0, 0, 0, 0, 0, 0, 0]
+    }
+
+    /// Returns [`true`] if this is a loopback address (::1).
+    ///
+    /// This property is defined in [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_loopback(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1).is_loopback(), true);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_loopback(&self) -> bool {
+        self.segments() == [0, 0, 0, 0, 0, 0, 0, 1]
+    }
+
+    /// Returns [`true`] if the address appears to be globally routable.
+    ///
+    /// The following return [`false`]:
+    ///
+    /// - the loopback address
+    /// - link-local, site-local, and unique local unicast addresses
+    /// - interface-, link-, realm-, admin- and site-local multicast addresses
+    ///
+    /// [`true`]: ../../std/primitive.bool.html
+    /// [`false`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_global(), true);
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1).is_global(), false);
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0x1c9, 0, 0, 0xafc8, 0, 0x1).is_global(), true);
+    /// }
+    /// ```
+    pub fn is_global(&self) -> bool {
+        match self.multicast_scope() {
+            Some(Ipv6MulticastScope::Global) => true,
+            None => self.is_unicast_global(),
+            _ => false
+        }
+    }
+
+    /// Returns [`true`] if this is a unique local address (fc00::/7).
+    ///
+    /// This property is defined in [IETF RFC 4193].
+    ///
+    /// [IETF RFC 4193]: https://tools.ietf.org/html/rfc4193
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unique_local(),
+    ///                false);
+    ///     assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 0).is_unique_local(), true);
+    /// }
+    /// ```
+    pub fn is_unique_local(&self) -> bool {
+        (self.segments()[0] & 0xfe00) == 0xfc00
+    }
+
+    /// Returns [`true`] if the address is unicast and link-local (fe80::/10).
+    ///
+    /// This property is defined in [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unicast_link_local(),
+    ///                false);
+    ///     assert_eq!(Ipv6Addr::new(0xfe8a, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true);
+    /// }
+    /// ```
+    pub fn is_unicast_link_local(&self) -> bool {
+        (self.segments()[0] & 0xffc0) == 0xfe80
+    }
+
+    /// Returns [`true`] if this is a deprecated unicast site-local address
+    /// (fec0::/10).
+    ///
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unicast_site_local(),
+    ///                false);
+    ///     assert_eq!(Ipv6Addr::new(0xfec2, 0, 0, 0, 0, 0, 0, 0).is_unicast_site_local(), true);
+    /// }
+    /// ```
+    pub fn is_unicast_site_local(&self) -> bool {
+        (self.segments()[0] & 0xffc0) == 0xfec0
+    }
+
+    /// Returns [`true`] if this is an address reserved for documentation
+    /// (2001:db8::/32).
+    ///
+    /// This property is defined in [IETF RFC 3849].
+    ///
+    /// [IETF RFC 3849]: https://tools.ietf.org/html/rfc3849
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_documentation(),
+    ///                false);
+    ///     assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_documentation(), true);
+    /// }
+    /// ```
+    pub fn is_documentation(&self) -> bool {
+        (self.segments()[0] == 0x2001) && (self.segments()[1] == 0xdb8)
+    }
+
+    /// Returns [`true`] if the address is a globally routable unicast address.
+    ///
+    /// The following return false:
+    ///
+    /// - the loopback address
+    /// - the link-local addresses
+    /// - the (deprecated) site-local addresses
+    /// - unique local addresses
+    /// - the unspecified address
+    /// - the address range reserved for documentation
+    ///
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_global(), false);
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unicast_global(),
+    ///                true);
+    /// }
+    /// ```
+    pub fn is_unicast_global(&self) -> bool {
+        !self.is_multicast()
+            && !self.is_loopback() && !self.is_unicast_link_local()
+            && !self.is_unicast_site_local() && !self.is_unique_local()
+            && !self.is_unspecified() && !self.is_documentation()
+    }
+
+    /// Returns the address's multicast scope if the address is multicast.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{Ipv6Addr, Ipv6MulticastScope};
+    ///
+    /// fn main() {
+    ///     assert_eq!(Ipv6Addr::new(0xff0e, 0, 0, 0, 0, 0, 0, 0).multicast_scope(),
+    ///                              Some(Ipv6MulticastScope::Global));
+    ///     assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).multicast_scope(), None);
+    /// }
+    /// ```
+    pub fn multicast_scope(&self) -> Option<Ipv6MulticastScope> {
+        if self.is_multicast() {
+            match self.segments()[0] & 0x000f {
+                1 => Some(Ipv6MulticastScope::InterfaceLocal),
+                2 => Some(Ipv6MulticastScope::LinkLocal),
+                3 => Some(Ipv6MulticastScope::RealmLocal),
+                4 => Some(Ipv6MulticastScope::AdminLocal),
+                5 => Some(Ipv6MulticastScope::SiteLocal),
+                8 => Some(Ipv6MulticastScope::OrganizationLocal),
+                14 => Some(Ipv6MulticastScope::Global),
+                _ => None
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Returns [`true`] if this is a multicast address (ff00::/8).
+    ///
+    /// This property is defined by [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [`true`]: ../../std/primitive.bool.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).is_multicast(), true);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_multicast(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "ip_17")]
+    pub fn is_multicast(&self) -> bool {
+        (self.segments()[0] & 0xff00) == 0xff00
+    }
+
+    /// Converts this address to an [IPv4 address]. Returns [`None`] if this address is
+    /// neither IPv4-compatible or IPv4-mapped.
+    ///
+    /// ::a.b.c.d and ::ffff:a.b.c.d become a.b.c.d
+    ///
+    /// [IPv4 address]: ../../std/net/struct.Ipv4Addr.html
+    /// [`None`]: ../../std/option/enum.Option.html#variant.None
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).to_ipv4(), None);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).to_ipv4(),
+    ///            Some(Ipv4Addr::new(192, 10, 2, 255)));
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4(),
+    ///            Some(Ipv4Addr::new(0, 0, 0, 1)));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn to_ipv4(&self) -> Option<Ipv4Addr> {
+        match self.segments() {
+            [0, 0, 0, 0, 0, f, g, h] if f == 0 || f == 0xffff => {
+                Some(Ipv4Addr::new((g >> 8) as u8, g as u8,
+                                   (h >> 8) as u8, h as u8))
+            },
+            _ => None
+        }
+    }
+
+    /// Returns the sixteen eight-bit integers the IPv6 address consists of.
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).octets(),
+    ///            [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+    /// ```
+    #[stable(feature = "ipv6_to_octets", since = "1.12.0")]
+    pub fn octets(&self) -> [u8; 16] {
+        self.inner.s6_addr
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Display for Ipv6Addr {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match self.segments() {
+            // We need special cases for :: and ::1, otherwise they're formatted
+            // as ::0.0.0.[01]
+            [0, 0, 0, 0, 0, 0, 0, 0] => write!(fmt, "::"),
+            [0, 0, 0, 0, 0, 0, 0, 1] => write!(fmt, "::1"),
+            // Ipv4 Compatible address
+            [0, 0, 0, 0, 0, 0, g, h] => {
+                write!(fmt, "::{}.{}.{}.{}", (g >> 8) as u8, g as u8,
+                       (h >> 8) as u8, h as u8)
+            }
+            // Ipv4-Mapped address
+            [0, 0, 0, 0, 0, 0xffff, g, h] => {
+                write!(fmt, "::ffff:{}.{}.{}.{}", (g >> 8) as u8, g as u8,
+                       (h >> 8) as u8, h as u8)
+            },
+            _ => {
+                fn find_zero_slice(segments: &[u16; 8]) -> (usize, usize) {
+                    let mut longest_span_len = 0;
+                    let mut longest_span_at = 0;
+                    let mut cur_span_len = 0;
+                    let mut cur_span_at = 0;
+
+                    for i in 0..8 {
+                        if segments[i] == 0 {
+                            if cur_span_len == 0 {
+                                cur_span_at = i;
+                            }
+
+                            cur_span_len += 1;
+
+                            if cur_span_len > longest_span_len {
+                                longest_span_len = cur_span_len;
+                                longest_span_at = cur_span_at;
+                            }
+                        } else {
+                            cur_span_len = 0;
+                            cur_span_at = 0;
+                        }
+                    }
+
+                    (longest_span_at, longest_span_len)
+                }
+
+                let (zeros_at, zeros_len) = find_zero_slice(&self.segments());
+
+                if zeros_len > 1 {
+                    fn fmt_subslice(segments: &[u16], fmt: &mut fmt::Formatter) -> fmt::Result {
+                        if !segments.is_empty() {
+                            write!(fmt, "{:x}", segments[0])?;
+                            for &seg in &segments[1..] {
+                                write!(fmt, ":{:x}", seg)?;
+                            }
+                        }
+                        Ok(())
+                    }
+
+                    fmt_subslice(&self.segments()[..zeros_at], fmt)?;
+                    fmt.write_str("::")?;
+                    fmt_subslice(&self.segments()[zeros_at + zeros_len..], fmt)
+                } else {
+                    let &[a, b, c, d, e, f, g, h] = &self.segments();
+                    write!(fmt, "{:x}:{:x}:{:x}:{:x}:{:x}:{:x}:{:x}:{:x}",
+                           a, b, c, d, e, f, g, h)
+                }
+            }
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Debug for Ipv6Addr {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(self, fmt)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Clone for Ipv6Addr {
+    fn clone(&self) -> Ipv6Addr { *self }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl PartialEq for Ipv6Addr {
+    fn eq(&self, other: &Ipv6Addr) -> bool {
+        self.inner.s6_addr == other.inner.s6_addr
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialEq<IpAddr> for Ipv6Addr {
+    fn eq(&self, other: &IpAddr) -> bool {
+        match *other {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(ref v6) => self == v6,
+        }
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialEq<Ipv6Addr> for IpAddr {
+    fn eq(&self, other: &Ipv6Addr) -> bool {
+        match *self {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(ref v6) => v6 == other,
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Eq for Ipv6Addr {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl hash::Hash for Ipv6Addr {
+    fn hash<H: hash::Hasher>(&self, s: &mut H) {
+        self.inner.s6_addr.hash(s)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl PartialOrd for Ipv6Addr {
+    fn partial_cmp(&self, other: &Ipv6Addr) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialOrd<Ipv6Addr> for IpAddr {
+    fn partial_cmp(&self, other: &Ipv6Addr) -> Option<Ordering> {
+        match *self {
+            IpAddr::V4(_) => Some(Ordering::Less),
+            IpAddr::V6(ref v6) => v6.partial_cmp(other),
+        }
+    }
+}
+
+#[stable(feature = "ip_cmp", since = "1.16.0")]
+impl PartialOrd<IpAddr> for Ipv6Addr {
+    fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering> {
+        match *other {
+            IpAddr::V4(_) => Some(Ordering::Greater),
+            IpAddr::V6(ref v6) => self.partial_cmp(v6),
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Ord for Ipv6Addr {
+    fn cmp(&self, other: &Ipv6Addr) -> Ordering {
+        self.segments().cmp(&other.segments())
+    }
+}
+
+impl AsInner<c::in6_addr> for Ipv6Addr {
+    fn as_inner(&self) -> &c::in6_addr { &self.inner }
+}
+impl FromInner<c::in6_addr> for Ipv6Addr {
+    fn from_inner(addr: c::in6_addr) -> Ipv6Addr {
+        Ipv6Addr { inner: addr }
+    }
+}
+
+#[unstable(feature = "i128", issue = "35118")]
+impl From<Ipv6Addr> for u128 {
+    fn from(ip: Ipv6Addr) -> u128 {
+        let ip = ip.segments();
+        ((ip[0] as u128) << 112) + ((ip[1] as u128) << 96) + ((ip[2] as u128) << 80) +
+            ((ip[3] as u128) << 64) + ((ip[4] as u128) << 48) + ((ip[5] as u128) << 32) +
+            ((ip[6] as u128) << 16) + (ip[7] as u128)
+    }
+}
+#[unstable(feature = "i128", issue = "35118")]
+impl From<u128> for Ipv6Addr {
+    fn from(ip: u128) -> Ipv6Addr {
+        Ipv6Addr::new(
+            (ip >> 112) as u16, (ip >> 96) as u16, (ip >> 80) as u16,
+            (ip >> 64) as u16, (ip >> 48) as u16, (ip >> 32) as u16,
+            (ip >> 16) as u16, ip as u16,
+        )
+    }
+}
+
+#[stable(feature = "ipv6_from_octets", since = "1.9.0")]
+impl From<[u8; 16]> for Ipv6Addr {
+    fn from(octets: [u8; 16]) -> Ipv6Addr {
+        let mut inner: c::in6_addr = unsafe { mem::zeroed() };
+        inner.s6_addr = octets;
+        Ipv6Addr::from_inner(inner)
+    }
+}
+
+#[stable(feature = "ipv6_from_segments", since = "1.16.0")]
+impl From<[u16; 8]> for Ipv6Addr {
+    fn from(segments: [u16; 8]) -> Ipv6Addr {
+        let [a, b, c, d, e, f, g, h] = segments;
+        Ipv6Addr::new(a, b, c, d, e, f, g, h)
+    }
+}
+
+
+#[stable(feature = "ip_from_slice", since = "1.17.0")]
+impl From<[u8; 16]> for IpAddr {
+    fn from(octets: [u8; 16]) -> IpAddr {
+        IpAddr::V6(Ipv6Addr::from(octets))
+    }
+}
+
+#[stable(feature = "ip_from_slice", since = "1.17.0")]
+impl From<[u16; 8]> for IpAddr {
+    fn from(segments: [u16; 8]) -> IpAddr {
+        IpAddr::V6(Ipv6Addr::from(segments))
+    }
+}
+
+// Tests for this module
+#[cfg(all(test, not(target_os = "emscripten")))]
+mod tests {
+    use net::*;
+    use net::Ipv6MulticastScope::*;
+    use net::test::{tsa, sa6, sa4};
+
+    #[test]
+    fn test_from_str_ipv4() {
+        assert_eq!(Ok(Ipv4Addr::new(127, 0, 0, 1)), "127.0.0.1".parse());
+        assert_eq!(Ok(Ipv4Addr::new(255, 255, 255, 255)), "255.255.255.255".parse());
+        assert_eq!(Ok(Ipv4Addr::new(0, 0, 0, 0)), "0.0.0.0".parse());
+
+        // out of range
+        let none: Option<Ipv4Addr> = "256.0.0.1".parse().ok();
+        assert_eq!(None, none);
+        // too short
+        let none: Option<Ipv4Addr> = "255.0.0".parse().ok();
+        assert_eq!(None, none);
+        // too long
+        let none: Option<Ipv4Addr> = "255.0.0.1.2".parse().ok();
+        assert_eq!(None, none);
+        // no number between dots
+        let none: Option<Ipv4Addr> = "255.0..1".parse().ok();
+        assert_eq!(None, none);
+    }
+
+    #[test]
+    fn test_from_str_ipv6() {
+        assert_eq!(Ok(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)), "0:0:0:0:0:0:0:0".parse());
+        assert_eq!(Ok(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)), "0:0:0:0:0:0:0:1".parse());
+
+        assert_eq!(Ok(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)), "::1".parse());
+        assert_eq!(Ok(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)), "::".parse());
+
+        assert_eq!(Ok(Ipv6Addr::new(0x2a02, 0x6b8, 0, 0, 0, 0, 0x11, 0x11)),
+                "2a02:6b8::11:11".parse());
+
+        // too long group
+        let none: Option<Ipv6Addr> = "::00000".parse().ok();
+        assert_eq!(None, none);
+        // too short
+        let none: Option<Ipv6Addr> = "1:2:3:4:5:6:7".parse().ok();
+        assert_eq!(None, none);
+        // too long
+        let none: Option<Ipv6Addr> = "1:2:3:4:5:6:7:8:9".parse().ok();
+        assert_eq!(None, none);
+        // triple colon
+        let none: Option<Ipv6Addr> = "1:2:::6:7:8".parse().ok();
+        assert_eq!(None, none);
+        // two double colons
+        let none: Option<Ipv6Addr> = "1:2::6::8".parse().ok();
+        assert_eq!(None, none);
+        // `::` indicating zero groups of zeros
+        let none: Option<Ipv6Addr> = "1:2:3:4::5:6:7:8".parse().ok();
+        assert_eq!(None, none);
+    }
+
+    #[test]
+    fn test_from_str_ipv4_in_ipv6() {
+        assert_eq!(Ok(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 49152, 545)),
+                "::192.0.2.33".parse());
+        assert_eq!(Ok(Ipv6Addr::new(0, 0, 0, 0, 0, 0xFFFF, 49152, 545)),
+                "::FFFF:192.0.2.33".parse());
+        assert_eq!(Ok(Ipv6Addr::new(0x64, 0xff9b, 0, 0, 0, 0, 49152, 545)),
+                "64:ff9b::192.0.2.33".parse());
+        assert_eq!(Ok(Ipv6Addr::new(0x2001, 0xdb8, 0x122, 0xc000, 0x2, 0x2100, 49152, 545)),
+                "2001:db8:122:c000:2:2100:192.0.2.33".parse());
+
+        // colon after v4
+        let none: Option<Ipv4Addr> = "::127.0.0.1:".parse().ok();
+        assert_eq!(None, none);
+        // not enough groups
+        let none: Option<Ipv6Addr> = "1.2.3.4.5:127.0.0.1".parse().ok();
+        assert_eq!(None, none);
+        // too many groups
+        let none: Option<Ipv6Addr> = "1.2.3.4.5:6:7:127.0.0.1".parse().ok();
+        assert_eq!(None, none);
+    }
+
+    #[test]
+    fn test_from_str_socket_addr() {
+        assert_eq!(Ok(sa4(Ipv4Addr::new(77, 88, 21, 11), 80)),
+                   "77.88.21.11:80".parse());
+        assert_eq!(Ok(SocketAddrV4::new(Ipv4Addr::new(77, 88, 21, 11), 80)),
+                   "77.88.21.11:80".parse());
+        assert_eq!(Ok(sa6(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 53)),
+                   "[2a02:6b8:0:1::1]:53".parse());
+        assert_eq!(Ok(SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1,
+                                                      0, 0, 0, 1), 53, 0, 0)),
+                   "[2a02:6b8:0:1::1]:53".parse());
+        assert_eq!(Ok(sa6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0x7F00, 1), 22)),
+                   "[::127.0.0.1]:22".parse());
+        assert_eq!(Ok(SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0,
+                                                      0x7F00, 1), 22, 0, 0)),
+                   "[::127.0.0.1]:22".parse());
+
+        // without port
+        let none: Option<SocketAddr> = "127.0.0.1".parse().ok();
+        assert_eq!(None, none);
+        // without port
+        let none: Option<SocketAddr> = "127.0.0.1:".parse().ok();
+        assert_eq!(None, none);
+        // wrong brackets around v4
+        let none: Option<SocketAddr> = "[127.0.0.1]:22".parse().ok();
+        assert_eq!(None, none);
+        // port out of range
+        let none: Option<SocketAddr> = "127.0.0.1:123456".parse().ok();
+        assert_eq!(None, none);
+    }
+
+    #[test]
+    fn ipv6_addr_to_string() {
+        // ipv4-mapped address
+        let a1 = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc000, 0x280);
+        assert_eq!(a1.to_string(), "::ffff:192.0.2.128");
+
+        // ipv4-compatible address
+        let a1 = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0xc000, 0x280);
+        assert_eq!(a1.to_string(), "::192.0.2.128");
+
+        // v6 address with no zero segments
+        assert_eq!(Ipv6Addr::new(8, 9, 10, 11, 12, 13, 14, 15).to_string(),
+                   "8:9:a:b:c:d:e:f");
+
+        // reduce a single run of zeros
+        assert_eq!("ae::ffff:102:304",
+                   Ipv6Addr::new(0xae, 0, 0, 0, 0, 0xffff, 0x0102, 0x0304).to_string());
+
+        // don't reduce just a single zero segment
+        assert_eq!("1:2:3:4:5:6:0:8",
+                   Ipv6Addr::new(1, 2, 3, 4, 5, 6, 0, 8).to_string());
+
+        // 'any' address
+        assert_eq!("::", Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0).to_string());
+
+        // loopback address
+        assert_eq!("::1", Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_string());
+
+        // ends in zeros
+        assert_eq!("1::", Ipv6Addr::new(1, 0, 0, 0, 0, 0, 0, 0).to_string());
+
+        // two runs of zeros, second one is longer
+        assert_eq!("1:0:0:4::8", Ipv6Addr::new(1, 0, 0, 4, 0, 0, 0, 8).to_string());
+
+        // two runs of zeros, equal length
+        assert_eq!("1::4:5:0:0:8", Ipv6Addr::new(1, 0, 0, 4, 5, 0, 0, 8).to_string());
+    }
+
+    #[test]
+    fn ipv4_to_ipv6() {
+        assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x1234, 0x5678),
+                   Ipv4Addr::new(0x12, 0x34, 0x56, 0x78).to_ipv6_mapped());
+        assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0x1234, 0x5678),
+                   Ipv4Addr::new(0x12, 0x34, 0x56, 0x78).to_ipv6_compatible());
+    }
+
+    #[test]
+    fn ipv6_to_ipv4() {
+        assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x1234, 0x5678).to_ipv4(),
+                   Some(Ipv4Addr::new(0x12, 0x34, 0x56, 0x78)));
+        assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0x1234, 0x5678).to_ipv4(),
+                   Some(Ipv4Addr::new(0x12, 0x34, 0x56, 0x78)));
+        assert_eq!(Ipv6Addr::new(0, 0, 1, 0, 0, 0, 0x1234, 0x5678).to_ipv4(),
+                   None);
+    }
+
+    #[test]
+    fn ip_properties() {
+        fn check4(octets: &[u8; 4], unspec: bool, loopback: bool,
+                  global: bool, multicast: bool, documentation: bool) {
+            let ip = IpAddr::V4(Ipv4Addr::new(octets[0], octets[1], octets[2], octets[3]));
+            assert_eq!(ip.is_unspecified(), unspec);
+            assert_eq!(ip.is_loopback(), loopback);
+            assert_eq!(ip.is_global(), global);
+            assert_eq!(ip.is_multicast(), multicast);
+            assert_eq!(ip.is_documentation(), documentation);
+        }
+
+        fn check6(str_addr: &str, unspec: bool, loopback: bool,
+                  global: bool, u_doc: bool, mcast: bool) {
+            let ip = IpAddr::V6(str_addr.parse().unwrap());
+            assert_eq!(ip.is_unspecified(), unspec);
+            assert_eq!(ip.is_loopback(), loopback);
+            assert_eq!(ip.is_global(), global);
+            assert_eq!(ip.is_documentation(), u_doc);
+            assert_eq!(ip.is_multicast(), mcast);
+        }
+
+        //     address                unspec loopbk global multicast doc
+        check4(&[0, 0, 0, 0],         true,  false, false,  false,   false);
+        check4(&[0, 0, 0, 1],         false, false, true,   false,   false);
+        check4(&[0, 1, 0, 0],         false, false, true,   false,   false);
+        check4(&[10, 9, 8, 7],        false, false, false,  false,   false);
+        check4(&[127, 1, 2, 3],       false, true,  false,  false,   false);
+        check4(&[172, 31, 254, 253],  false, false, false,  false,   false);
+        check4(&[169, 254, 253, 242], false, false, false,  false,   false);
+        check4(&[192, 0, 2, 183],     false, false, false,  false,   true);
+        check4(&[192, 1, 2, 183],     false, false, true,   false,   false);
+        check4(&[192, 168, 254, 253], false, false, false,  false,   false);
+        check4(&[198, 51, 100, 0],    false, false, false,  false,   true);
+        check4(&[203, 0, 113, 0],     false, false, false,  false,   true);
+        check4(&[203, 2, 113, 0],     false, false, true,   false,   false);
+        check4(&[224, 0, 0, 0],       false, false, true,   true,    false);
+        check4(&[239, 255, 255, 255], false, false, true,   true,    false);
+        check4(&[255, 255, 255, 255], false, false, false,  false,   false);
+
+        //     address                            unspec loopbk global doc    mcast
+        check6("::",                              true,  false, false, false, false);
+        check6("::1",                             false, true,  false, false, false);
+        check6("::0.0.0.2",                       false, false, true,  false, false);
+        check6("1::",                             false, false, true,  false, false);
+        check6("fc00::",                          false, false, false, false, false);
+        check6("fdff:ffff::",                     false, false, false, false, false);
+        check6("fe80:ffff::",                     false, false, false, false, false);
+        check6("febf:ffff::",                     false, false, false, false, false);
+        check6("fec0::",                          false, false, false, false, false);
+        check6("ff01::",                          false, false, false, false, true);
+        check6("ff02::",                          false, false, false, false, true);
+        check6("ff03::",                          false, false, false, false, true);
+        check6("ff04::",                          false, false, false, false, true);
+        check6("ff05::",                          false, false, false, false, true);
+        check6("ff08::",                          false, false, false, false, true);
+        check6("ff0e::",                          false, false, true,  false, true);
+        check6("2001:db8:85a3::8a2e:370:7334",    false, false, false, true,  false);
+        check6("102:304:506:708:90a:b0c:d0e:f10", false, false, true,  false, false);
+    }
+
+    #[test]
+    fn ipv4_properties() {
+        fn check(octets: &[u8; 4], unspec: bool, loopback: bool,
+                 private: bool, link_local: bool, global: bool,
+                 multicast: bool, broadcast: bool, documentation: bool) {
+            let ip = Ipv4Addr::new(octets[0], octets[1], octets[2], octets[3]);
+            assert_eq!(octets, &ip.octets());
+
+            assert_eq!(ip.is_unspecified(), unspec);
+            assert_eq!(ip.is_loopback(), loopback);
+            assert_eq!(ip.is_private(), private);
+            assert_eq!(ip.is_link_local(), link_local);
+            assert_eq!(ip.is_global(), global);
+            assert_eq!(ip.is_multicast(), multicast);
+            assert_eq!(ip.is_broadcast(), broadcast);
+            assert_eq!(ip.is_documentation(), documentation);
+        }
+
+        //    address                unspec loopbk privt  linloc global multicast brdcast doc
+        check(&[0, 0, 0, 0],         true,  false, false, false, false,  false,    false,  false);
+        check(&[0, 0, 0, 1],         false, false, false, false, true,   false,    false,  false);
+        check(&[0, 1, 0, 0],         false, false, false, false, true,   false,    false,  false);
+        check(&[10, 9, 8, 7],        false, false, true,  false, false,  false,    false,  false);
+        check(&[127, 1, 2, 3],       false, true,  false, false, false,  false,    false,  false);
+        check(&[172, 31, 254, 253],  false, false, true,  false, false,  false,    false,  false);
+        check(&[169, 254, 253, 242], false, false, false, true,  false,  false,    false,  false);
+        check(&[192, 0, 2, 183],     false, false, false, false, false,  false,    false,  true);
+        check(&[192, 1, 2, 183],     false, false, false, false, true,   false,    false,  false);
+        check(&[192, 168, 254, 253], false, false, true,  false, false,  false,    false,  false);
+        check(&[198, 51, 100, 0],    false, false, false, false, false,  false,    false,  true);
+        check(&[203, 0, 113, 0],     false, false, false, false, false,  false,    false,  true);
+        check(&[203, 2, 113, 0],     false, false, false, false, true,   false,    false,  false);
+        check(&[224, 0, 0, 0],       false, false, false, false, true,   true,     false,  false);
+        check(&[239, 255, 255, 255], false, false, false, false, true,   true,     false,  false);
+        check(&[255, 255, 255, 255], false, false, false, false, false,  false,    true,   false);
+    }
+
+    #[test]
+    fn ipv6_properties() {
+        fn check(str_addr: &str, octets: &[u8; 16], unspec: bool, loopback: bool,
+                 unique_local: bool, global: bool,
+                 u_link_local: bool, u_site_local: bool, u_global: bool, u_doc: bool,
+                 m_scope: Option<Ipv6MulticastScope>) {
+            let ip: Ipv6Addr = str_addr.parse().unwrap();
+            assert_eq!(str_addr, ip.to_string());
+            assert_eq!(&ip.octets(), octets);
+            assert_eq!(Ipv6Addr::from(*octets), ip);
+
+            assert_eq!(ip.is_unspecified(), unspec);
+            assert_eq!(ip.is_loopback(), loopback);
+            assert_eq!(ip.is_unique_local(), unique_local);
+            assert_eq!(ip.is_global(), global);
+            assert_eq!(ip.is_unicast_link_local(), u_link_local);
+            assert_eq!(ip.is_unicast_site_local(), u_site_local);
+            assert_eq!(ip.is_unicast_global(), u_global);
+            assert_eq!(ip.is_documentation(), u_doc);
+            assert_eq!(ip.multicast_scope(), m_scope);
+            assert_eq!(ip.is_multicast(), m_scope.is_some());
+        }
+
+        //    unspec loopbk uniqlo global unill  unisl  uniglo doc    mscope
+        check("::", &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              true,  false, false, false, false, false, false, false, None);
+        check("::1", &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
+              false, true,  false, false, false, false, false, false, None);
+        check("::0.0.0.2", &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2],
+              false, false, false, true,  false, false, true,  false, None);
+        check("1::", &[0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, true,  false, false, true,  false, None);
+        check("fc00::", &[0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, true,  false, false, false, false, false, None);
+        check("fdff:ffff::", &[0xfd, 0xff, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, true,  false, false, false, false, false, None);
+        check("fe80:ffff::", &[0xfe, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, true,  false, false, false, None);
+        check("febf:ffff::", &[0xfe, 0xbf, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, true,  false, false, false, None);
+        check("fec0::", &[0xfe, 0xc0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, true,  false, false, None);
+        check("ff01::", &[0xff, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, false, false, false, Some(InterfaceLocal));
+        check("ff02::", &[0xff, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, false, false, false, Some(LinkLocal));
+        check("ff03::", &[0xff, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, false, false, false, Some(RealmLocal));
+        check("ff04::", &[0xff, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, false, false, false, Some(AdminLocal));
+        check("ff05::", &[0xff, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, false, false, false, Some(SiteLocal));
+        check("ff08::", &[0xff, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, false, false, false, false, false, Some(OrganizationLocal));
+        check("ff0e::", &[0xff, 0xe, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+              false, false, false, true,  false, false, false, false, Some(Global));
+        check("2001:db8:85a3::8a2e:370:7334",
+              &[0x20, 1, 0xd, 0xb8, 0x85, 0xa3, 0, 0, 0, 0, 0x8a, 0x2e, 3, 0x70, 0x73, 0x34],
+              false, false, false, false, false, false, false, true, None);
+        check("102:304:506:708:90a:b0c:d0e:f10",
+              &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16],
+              false, false, false, true,  false, false, true,  false, None);
+    }
+
+    #[test]
+    fn to_socket_addr_socketaddr() {
+        let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 12345);
+        assert_eq!(Ok(vec![a]), tsa(a));
+    }
+
+    #[test]
+    fn test_ipv4_to_int() {
+        let a = Ipv4Addr::new(0x11, 0x22, 0x33, 0x44);
+        assert_eq!(u32::from(a), 0x11223344);
+    }
+
+    #[test]
+    fn test_int_to_ipv4() {
+        let a = Ipv4Addr::new(0x11, 0x22, 0x33, 0x44);
+        assert_eq!(Ipv4Addr::from(0x11223344), a);
+    }
+
+    #[test]
+    fn test_ipv6_to_int() {
+        let a = Ipv6Addr::new(0x1122, 0x3344, 0x5566, 0x7788, 0x99aa, 0xbbcc, 0xddee, 0xff11);
+        assert_eq!(u128::from(a), 0x112233445566778899aabbccddeeff11u128);
+    }
+
+    #[test]
+    fn test_int_to_ipv6() {
+        let a = Ipv6Addr::new(0x1122, 0x3344, 0x5566, 0x7788, 0x99aa, 0xbbcc, 0xddee, 0xff11);
+        assert_eq!(Ipv6Addr::from(0x112233445566778899aabbccddeeff11u128), a);
+    }
+
+    #[test]
+    fn ipv4_from_constructors() {
+        assert_eq!(Ipv4Addr::localhost(), Ipv4Addr::new(127, 0, 0, 1));
+        assert!(Ipv4Addr::localhost().is_loopback());
+        assert_eq!(Ipv4Addr::unspecified(), Ipv4Addr::new(0, 0, 0, 0));
+        assert!(Ipv4Addr::unspecified().is_unspecified());
+    }
+
+    #[test]
+    fn ipv6_from_contructors() {
+        assert_eq!(Ipv6Addr::localhost(), Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+        assert!(Ipv6Addr::localhost().is_loopback());
+        assert_eq!(Ipv6Addr::unspecified(), Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+        assert!(Ipv6Addr::unspecified().is_unspecified());
+    }
+
+    #[test]
+    fn ipv4_from_octets() {
+        assert_eq!(Ipv4Addr::from([127, 0, 0, 1]), Ipv4Addr::new(127, 0, 0, 1))
+    }
+
+    #[test]
+    fn ipv6_from_segments() {
+        let from_u16s = Ipv6Addr::from([0x0011, 0x2233, 0x4455, 0x6677,
+                                        0x8899, 0xaabb, 0xccdd, 0xeeff]);
+        let new = Ipv6Addr::new(0x0011, 0x2233, 0x4455, 0x6677,
+                                0x8899, 0xaabb, 0xccdd, 0xeeff);
+        assert_eq!(new, from_u16s);
+    }
+
+    #[test]
+    fn ipv6_from_octets() {
+        let from_u16s = Ipv6Addr::from([0x0011, 0x2233, 0x4455, 0x6677,
+                                        0x8899, 0xaabb, 0xccdd, 0xeeff]);
+        let from_u8s = Ipv6Addr::from([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+                                       0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff]);
+        assert_eq!(from_u16s, from_u8s);
+    }
+
+    #[test]
+    fn cmp() {
+        let v41 = Ipv4Addr::new(100, 64, 3, 3);
+        let v42 = Ipv4Addr::new(192, 0, 2, 2);
+        let v61 = "2001:db8:f00::1002".parse::<Ipv6Addr>().unwrap();
+        let v62 = "2001:db8:f00::2001".parse::<Ipv6Addr>().unwrap();
+        assert!(v41 < v42);
+        assert!(v61 < v62);
+
+        assert_eq!(v41, IpAddr::V4(v41));
+        assert_eq!(v61, IpAddr::V6(v61));
+        assert!(v41 != IpAddr::V4(v42));
+        assert!(v61 != IpAddr::V6(v62));
+
+        assert!(v41 < IpAddr::V4(v42));
+        assert!(v61 < IpAddr::V6(v62));
+        assert!(IpAddr::V4(v41) < v42);
+        assert!(IpAddr::V6(v61) < v62);
+
+        assert!(v41 < IpAddr::V6(v61));
+        assert!(IpAddr::V4(v41) < v61);
+    }
+
+    #[test]
+    fn is_v4() {
+        let ip = IpAddr::V4(Ipv4Addr::new(100, 64, 3, 3));
+        assert!(ip.is_ipv4());
+        assert!(!ip.is_ipv6());
+    }
+
+    #[test]
+    fn is_v6() {
+        let ip = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x1234, 0x5678));
+        assert!(!ip.is_ipv4());
+        assert!(ip.is_ipv6());
+    }
+}