Struct std::net::Ipv4Addr

pub struct Ipv4Addr { /* fields omitted */ }

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.

The size of an Ipv4Addr struct may vary depending on the target operating system.

Textual representation

Ipv4Addr provides a FromStr implementation. The four octets are in decimal notation, divided by . (this is called “dot-decimal notation”). Notably, octal numbers (which are indicated with a leading 0) and hexadecimal numbers (which are indicated with a leading 0x) are not allowed per IETF RFC 6943.

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);
assert!("012.004.002.000".parse::<Ipv4Addr>().is_err()); // all octets are in octal
assert!("0000000.0.0.0".parse::<Ipv4Addr>().is_err()); // first octet is a zero in octal
assert!("0xcb.0x0.0x71.0x00".parse::<Ipv4Addr>().is_err()); // all octets are in hex

Implementations

impl Ipv4Addr

pub const fn new(a: u8, b: u8, c: u8, d: u8) -> 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);

pub const LOCALHOST: Self

An IPv4 address with the address pointing to localhost: 127.0.0.1

Examples

use std::net::Ipv4Addr;

let addr = Ipv4Addr::LOCALHOST;
assert_eq!(addr, Ipv4Addr::new(127, 0, 0, 1));

pub const UNSPECIFIED: Self

An IPv4 address representing an unspecified address: 0.0.0.0

This corresponds to the constant INADDR_ANY in other languages.

Examples

use std::net::Ipv4Addr;

let addr = Ipv4Addr::UNSPECIFIED;
assert_eq!(addr, Ipv4Addr::new(0, 0, 0, 0));

pub const BROADCAST: Self

An IPv4 address representing the broadcast address: 255.255.255.255

Examples

use std::net::Ipv4Addr;

let addr = Ipv4Addr::BROADCAST;
assert_eq!(addr, Ipv4Addr::new(255, 255, 255, 255));

pub const fn octets(&self) -> [u8; 4]

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]);

pub const fn is_unspecified(&self) -> bool

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.

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);

pub const fn is_loopback(&self) -> bool

Returns true if this is a loopback address (127.0.0.0/8).

This property is defined by IETF RFC 1122.

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);

pub const fn is_private(&self) -> bool

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

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);

pub const fn is_link_local(&self) -> bool

Returns true if the address is link-local (169.254.0.0/16).

This property is defined by IETF RFC 3927.

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);

pub fn is_global(&self) -> bool

🔬 This is a nightly-only experimental API. (ip #27709)

Returns true if the address appears to be globally routable. See iana-ipv4-special-registry.

The following return false:

• private addresses (see Ipv4Addr::is_private())
• the loopback address (see Ipv4Addr::is_loopback())
• the link-local address (see Ipv4Addr::is_link_local())
• the broadcast address (see Ipv4Addr::is_broadcast())
• addresses used for documentation (see Ipv4Addr::is_documentation())
• the unspecified address (see Ipv4Addr::is_unspecified()), and the whole 0.0.0.0/8 block
• addresses reserved for future protocols, except 192.0.0.9/32 and 192.0.0.10/32 which are globally routable
• addresses reserved for future use (see Ipv4Addr::is_reserved()
• addresses reserved for networking devices benchmarking (see Ipv4Addr::is_benchmarking())

Examples

#![feature(ip)]

use std::net::Ipv4Addr;

// private addresses are not global
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);

// the 0.0.0.0/8 block is not global
assert_eq!(Ipv4Addr::new(0, 1, 2, 3).is_global(), false);
// in particular, the unspecified address is not global
assert_eq!(Ipv4Addr::new(0, 0, 0, 0).is_global(), false);

// the loopback address is not global
assert_eq!(Ipv4Addr::new(127, 0, 0, 1).is_global(), false);

// link local addresses are not global
assert_eq!(Ipv4Addr::new(169, 254, 45, 1).is_global(), false);

// the broadcast address is not global
assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_global(), false);

// the address space designated for documentation is not global
assert_eq!(Ipv4Addr::new(192, 0, 2, 255).is_global(), false);
assert_eq!(Ipv4Addr::new(198, 51, 100, 65).is_global(), false);
assert_eq!(Ipv4Addr::new(203, 0, 113, 6).is_global(), false);

// shared addresses are not global
assert_eq!(Ipv4Addr::new(100, 100, 0, 0).is_global(), false);

// addresses reserved for protocol assignment are not global
assert_eq!(Ipv4Addr::new(192, 0, 0, 0).is_global(), false);
assert_eq!(Ipv4Addr::new(192, 0, 0, 255).is_global(), false);

// addresses reserved for future use are not global
assert_eq!(Ipv4Addr::new(250, 10, 20, 30).is_global(), false);

// addresses reserved for network devices benchmarking are not global
assert_eq!(Ipv4Addr::new(198, 18, 0, 0).is_global(), false);

// All the other addresses are global
assert_eq!(Ipv4Addr::new(1, 1, 1, 1).is_global(), true);
assert_eq!(Ipv4Addr::new(80, 9, 12, 3).is_global(), true);

pub fn is_shared(&self) -> bool

🔬 This is a nightly-only experimental API. (ip #27709)

Returns true if this address is part of the Shared Address Space defined in IETF RFC 6598 (100.64.0.0/10).

Examples

#![feature(ip)]
use std::net::Ipv4Addr;

assert_eq!(Ipv4Addr::new(100, 64, 0, 0).is_shared(), true);
assert_eq!(Ipv4Addr::new(100, 127, 255, 255).is_shared(), true);
assert_eq!(Ipv4Addr::new(100, 128, 0, 0).is_shared(), false);

pub fn is_benchmarking(&self) -> bool

🔬 This is a nightly-only experimental API. (ip #27709)

Returns true if this address part of the 198.18.0.0/15 range, which is reserved for network devices benchmarking. This range is defined in IETF RFC 2544 as 192.18.0.0 through 198.19.255.255 but errata 423 corrects it to 198.18.0.0/15.

Examples

#![feature(ip)]
use std::net::Ipv4Addr;

assert_eq!(Ipv4Addr::new(198, 17, 255, 255).is_benchmarking(), false);
assert_eq!(Ipv4Addr::new(198, 18, 0, 0).is_benchmarking(), true);
assert_eq!(Ipv4Addr::new(198, 19, 255, 255).is_benchmarking(), true);
assert_eq!(Ipv4Addr::new(198, 20, 0, 0).is_benchmarking(), false);

pub fn is_reserved(&self) -> bool

🔬 This is a nightly-only experimental API. (ip #27709)

Returns true if this address is reserved by IANA for future use. IETF RFC 1112 defines the block of reserved addresses as 240.0.0.0/4. This range normally includes the broadcast address 255.255.255.255, but this implementation explicitly excludes it, since it is obviously not reserved for future use.

Warning

As IANA assigns new addresses, this method will be updated. This may result in non-reserved addresses being treated as reserved in code that relies on an outdated version of this method.

Examples

#![feature(ip)]
use std::net::Ipv4Addr;

assert_eq!(Ipv4Addr::new(240, 0, 0, 0).is_reserved(), true);
assert_eq!(Ipv4Addr::new(255, 255, 255, 254).is_reserved(), true);

assert_eq!(Ipv4Addr::new(239, 255, 255, 255).is_reserved(), false);
// The broadcast address is not considered as reserved for future use by this implementation
assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_reserved(), false);

pub const fn is_multicast(&self) -> bool

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.

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);

pub const fn is_broadcast(&self) -> bool

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.

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);

pub const fn is_documentation(&self) -> bool

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)

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);

pub const fn to_ipv6_compatible(&self) -> Ipv6Addr

Converts this address to an IPv4-compatible IPv6 address.

a.b.c.d becomes ::a.b.c.d

Note that IPv4-compatible addresses have been officially deprecated. If you don’t explicitly need an IPv4-compatible address for legacy reasons, consider using to_ipv6_mapped instead.

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, 0xc000, 0x2ff)
);

pub const fn to_ipv6_mapped(&self) -> Ipv6Addr

Converts this address to an IPv4-mapped IPv6 address.

a.b.c.d becomes ::ffff:a.b.c.d

Examples

use std::net::{Ipv4Addr, Ipv6Addr};

assert_eq!(Ipv4Addr::new(192, 0, 2, 255).to_ipv6_mapped(),
           Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc000, 0x2ff));

Trait Implementations

impl Clone for Ipv4Addr

fn clone(&self) -> Ipv4Addr

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Ipv4Addr

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Ipv4Addr

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<[u8; 4]> for Ipv4Addr

fn from(octets: [u8; 4]) -> Ipv4Addr

Creates an Ipv4Addr from a four element byte array.

Examples

use std::net::Ipv4Addr;

let addr = Ipv4Addr::from([13u8, 12u8, 11u8, 10u8]);
assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);

impl From<Ipv4Addr> for IpAddr

fn from(ipv4: Ipv4Addr) -> IpAddr

Copies this address to a new IpAddr::V4.

Examples

use std::net::{IpAddr, Ipv4Addr};

let addr = Ipv4Addr::new(127, 0, 0, 1);

assert_eq!(
    IpAddr::V4(addr),
    IpAddr::from(addr)
)

impl From<Ipv4Addr> for u32

fn from(ip: Ipv4Addr) -> u32

Converts an Ipv4Addr into a host byte order u32.

Examples

use std::net::Ipv4Addr;

let addr = Ipv4Addr::new(0xca, 0xfe, 0xba, 0xbe);
assert_eq!(0xcafebabe, u32::from(addr));

impl From<u32> for Ipv4Addr

fn from(ip: u32) -> Ipv4Addr

Converts a host byte order u32 into an Ipv4Addr.

Examples

use std::net::Ipv4Addr;

let addr = Ipv4Addr::from(0xcafebabe);
assert_eq!(Ipv4Addr::new(0xca, 0xfe, 0xba, 0xbe), addr);

impl FromStr for Ipv4Addr

type Err = AddrParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Ipv4Addr, AddrParseError>

Parses a string s to return a value of this type.

impl Hash for Ipv4Addr

fn hash<H: Hasher>(&self, s: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for Ipv4Addr

fn cmp(&self, other: &Ipv4Addr) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<IpAddr> for Ipv4Addr

fn eq(&self, other: &IpAddr) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<Ipv4Addr> for Ipv4Addr

fn eq(&self, other: &Ipv4Addr) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<Ipv4Addr> for IpAddr

fn eq(&self, other: &Ipv4Addr) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialOrd<IpAddr> for Ipv4Addr

fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<Ipv4Addr> for Ipv4Addr

fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<Ipv4Addr> for IpAddr

fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Ipv4Addr

impl Eq for Ipv4Addr