# Struct std::net::Ipv4Addr 1.0.0 [−] [src]

    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.

# Textual representation

`Ipv4Addr` provides a `FromStr` implementation. The four octets are in decimal notation, divided by `.` (this is called "dot-decimal notation").

# 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);Run

## Methods

### `impl Ipv4Addr`
[src]

#### `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);Run

#### `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]);Run

#### `fn is_unspecified(&self) -> bool`
1.12.0

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);Run

#### `fn is_loopback(&self) -> bool`
1.7.0

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);Run

#### `fn is_private(&self) -> bool`
1.7.0

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);Run

#### `fn is_link_local(&self) -> bool`
1.7.0

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);Run

#### `fn is_global(&self) -> bool`

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

extra functionality has not been scrutinized to the level that it should be stable

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

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)

# 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);
    }Run

#### `fn is_multicast(&self) -> bool`
1.7.0

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);Run

#### `fn is_broadcast(&self) -> bool`
1.7.0

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);Run

#### `fn is_documentation(&self) -> bool`
1.7.0

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);Run

#### `fn to_ipv6_compatible(&self) -> Ipv6Addr`

Converts this address to an IPv4-compatible IPv6 address.

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

# 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));Run

#### `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, 65535, 49152, 767));Run

## Trait Implementations

### `impl Copy for Ipv4Addr`
[src]

### `impl Display for Ipv4Addr`
[src]

#### `fn fmt(&self, fmt: &mut Formatter) -> Result`

Formats the value using the given formatter. Read more

### `impl Debug for Ipv4Addr`
[src]

#### `fn fmt(&self, fmt: &mut Formatter) -> Result`

Formats the value using the given formatter.

### `impl Clone for Ipv4Addr`
[src]

#### `fn clone(&self) -> Ipv4Addr`

Returns a copy of the value. Read more

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

Performs copy-assignment from `source`. Read more

### `impl PartialEq for Ipv4Addr`
[src]

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

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

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

This method tests for `!=`.

### `impl PartialEq<IpAddr> for Ipv4Addr`
1.15.0
[src]

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

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

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

This method tests for `!=`.

### `impl Eq for Ipv4Addr`
[src]

### `impl Hash for Ipv4Addr`
[src]

#### `fn hash<H: Hasher>(&self, s: &mut H)`

Feeds this value into the state given, updating the hasher as necessary.

#### `fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher`
1.3.0

Feeds a slice of this type into the state provided.

### `impl PartialOrd for Ipv4Addr`
[src]

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

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

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

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

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

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

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

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

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

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

### `impl PartialOrd<IpAddr> for Ipv4Addr`
1.15.0
[src]

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

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

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

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

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

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

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

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

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

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

### `impl Ord for Ipv4Addr`
[src]

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

This method returns an `Ordering` between `self` and `other`. Read more

### `impl From<u32> for Ipv4Addr`
1.1.0
[src]

#### `fn from(ip: u32) -> Ipv4Addr`

It performs the conversion in network order (big-endian).

### `impl From<[u8; 4]> for Ipv4Addr`
1.9.0
[src]

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

Performs the conversion.

### `impl FromStr for Ipv4Addr`
[src]

#### `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. Read more

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