# 1.0.0[−][src]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").

# 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]

#### `pub const fn new(a: u8, b: u8, c: u8, d: u8) -> Ipv4Addr`[src]

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

#### `pub const LOCALHOST: Self` 1.30.0[src]

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));Run

#### `pub const UNSPECIFIED: Self` 1.30.0[src]

An IPv4 address representing an unspecified address: 0.0.0.0

# Examples

    use std::net::Ipv4Addr;

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

#### `pub const BROADCAST: Self` 1.30.0[src]

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));Run

#### `pub fn octets(&self) -> [u8; 4]`[src]

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

#### `pub const fn is_unspecified(&self) -> bool` 1.12.0[src]

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

#### `pub fn is_loopback(&self) -> bool` 1.7.0[src]

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

#### `pub fn is_private(&self) -> bool` 1.7.0[src]

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

#### `pub fn is_link_local(&self) -> bool` 1.7.0[src]

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

#### `pub fn is_global(&self) -> bool`[src]

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

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

#### `pub fn is_multicast(&self) -> bool` 1.7.0[src]

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

#### `pub fn is_broadcast(&self) -> bool` 1.7.0[src]

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

#### `pub fn is_documentation(&self) -> bool` 1.7.0[src]

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

#### `pub fn to_ipv6_compatible(&self) -> Ipv6Addr`[src]

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

#### `pub fn to_ipv6_mapped(&self) -> Ipv6Addr`[src]

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 PartialEq<Ipv4Addr> for Ipv4Addr`[src]

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

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

#### `
#[must_use]
fn ne(&self, other: &Rhs) -> bool`[src]

This method tests for `!=`.

### `impl PartialEq<Ipv4Addr> for IpAddr` 1.16.0[src]

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

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

#### `
#[must_use]
fn ne(&self, other: &Rhs) -> bool`[src]

This method tests for `!=`.

### `impl PartialEq<IpAddr> for Ipv4Addr` 1.16.0[src]

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

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

#### `
#[must_use]
fn ne(&self, other: &Rhs) -> bool`[src]

This method tests for `!=`.

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

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

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

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

#### `fn max(self, other: Self) -> Self` 1.21.0[src]

Compares and returns the maximum of two values. Read more

#### `fn min(self, other: Self) -> Self` 1.21.0[src]

Compares and returns the minimum of two values. Read more

#### `fn clamp(self, min: Self, max: Self) -> Self`[src]

🔬 This is a nightly-only experimental API. (`clamp` #44095)

Restrict a value to a certain interval. Read more

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

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

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

#### `
#[must_use]
fn lt(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn le(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn gt(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn ge(&self, other: &Rhs) -> bool`[src]

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

### `impl PartialOrd<Ipv4Addr> for IpAddr` 1.16.0[src]

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

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

#### `
#[must_use]
fn lt(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn le(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn gt(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn ge(&self, other: &Rhs) -> bool`[src]

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` 1.16.0[src]

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

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

#### `
#[must_use]
fn lt(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn le(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn gt(&self, other: &Rhs) -> bool`[src]

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

#### `
#[must_use]
fn ge(&self, other: &Rhs) -> bool`[src]

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

### `impl From<Ipv4Addr> for IpAddr` 1.16.0[src]

#### `fn from(ipv4: Ipv4Addr) -> IpAddr`[src]

Performs the conversion.

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

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

Converts an `Ipv4Addr` into a host byte order `u32`.

# Examples

    use std::net::Ipv4Addr;

    let addr = Ipv4Addr::new(13, 12, 11, 10);
    assert_eq!(0x0d0c0b0au32, u32::from(addr));Run

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

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

Converts a host byte order `u32` into an `Ipv4Addr`.

# Examples

    use std::net::Ipv4Addr;

    let addr = Ipv4Addr::from(0x0d0c0b0au32);
    assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);Run

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

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

# Examples

    use std::net::Ipv4Addr;

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

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

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

Formats the value using the given formatter. Read more

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

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

Formats the value using the given formatter. Read more

### `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>`[src]

Parses a string `s` to return a value of this type. Read more

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

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

Feeds this value into the given [`Hasher`]. Read more

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

Feeds a slice of this type into the given [`Hasher`]. Read more

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

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

#### `fn clone(&self) -> Ipv4Addr`[src]

Returns a copy of the value. Read more

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

Performs copy-assignment from `source`. Read more

## Auto Trait Implementations

### `impl Send for Ipv4Addr`

### `impl Sync for Ipv4Addr`

## Blanket Implementations

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T> ToString for T where
T: Display + ?Sized,` [src]

#### `default fn to_string(&self) -> String`[src]

Converts the given value to a `String`. Read more

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