ipaddress --- IPv4/IPv6 操作函式庫

原始碼：Lib/ipaddress.py

ipaddress provides the capabilities to create, manipulate and operate on IPv4 and IPv6 addresses and networks.

The functions and classes in this module make it straightforward to handle various tasks related to IP addresses, including checking whether or not two hosts are on the same subnet, iterating over all hosts in a particular subnet, checking whether or not a string represents a valid IP address or network definition, and so on.

This is the full module API reference—for an overview and introduction, see ipaddress 模組介紹.

在 3.3 版被加入.

Convenience factory functions

The ipaddress module provides factory functions to conveniently create IP addresses, networks and interfaces:

ipaddress.ip_address(address)

Return an IPv4Address or IPv6Address object depending on the IP address passed as argument. Either IPv4 or IPv6 addresses may be supplied; integers less than 2**32 will be considered to be IPv4 by default. A ValueError is raised if address does not represent a valid IPv4 or IPv6 address.

>>> ipaddress.ip_address('192.168.0.1')
IPv4Address('192.168.0.1')
>>> ipaddress.ip_address('2001:db8::')
IPv6Address('2001:db8::')
ipaddress.ip_network(address, strict=True)

Return an IPv4Network or IPv6Network object depending on the IP address passed as argument. address is a string or integer representing the IP network. Either IPv4 or IPv6 networks may be supplied; integers less than 2**32 will be considered to be IPv4 by default. strict is passed to IPv4Network or IPv6Network constructor. A ValueError is raised if address does not represent a valid IPv4 or IPv6 address, or if the network has host bits set.

>>> ipaddress.ip_network('192.168.0.0/28')
IPv4Network('192.168.0.0/28')
ipaddress.ip_interface(address)

Return an IPv4Interface or IPv6Interface object depending on the IP address passed as argument. address is a string or integer representing the IP address. Either IPv4 or IPv6 addresses may be supplied; integers less than 2**32 will be considered to be IPv4 by default. A ValueError is raised if address does not represent a valid IPv4 or IPv6 address.

One downside of these convenience functions is that the need to handle both IPv4 and IPv6 formats means that error messages provide minimal information on the precise error, as the functions don't know whether the IPv4 or IPv6 format was intended. More detailed error reporting can be obtained by calling the appropriate version specific class constructors directly.

IP Addresses

Address objects

The IPv4Address and IPv6Address objects share a lot of common attributes. Some attributes that are only meaningful for IPv6 addresses are also implemented by IPv4Address objects, in order to make it easier to write code that handles both IP versions correctly. Address objects are hashable, so they can be used as keys in dictionaries.

class ipaddress.IPv4Address(address)

Construct an IPv4 address. An AddressValueError is raised if address is not a valid IPv4 address.

The following constitutes a valid IPv4 address:

  1. A string in decimal-dot notation, consisting of four decimal integers in the inclusive range 0--255, separated by dots (e.g. 192.168.0.1). Each integer represents an octet (byte) in the address. Leading zeroes are not tolerated to prevent confusion with octal notation.

  2. 一個可以放入 32 位元的整數。

  3. An integer packed into a bytes object of length 4 (most significant octet first).

>>> ipaddress.IPv4Address('192.168.0.1')
IPv4Address('192.168.0.1')
>>> ipaddress.IPv4Address(3232235521)
IPv4Address('192.168.0.1')
>>> ipaddress.IPv4Address(b'\xC0\xA8\x00\x01')
IPv4Address('192.168.0.1')

在 3.8 版的變更: Leading zeros are tolerated, even in ambiguous cases that look like octal notation.

在 3.9.5 版的變更: Leading zeros are no longer tolerated and are treated as an error. IPv4 address strings are now parsed as strict as glibc inet_pton().

version

The appropriate version number: 4 for IPv4, 6 for IPv6.

在 3.14 版的變更: Made available on the class.

max_prefixlen

The total number of bits in the address representation for this version: 32 for IPv4, 128 for IPv6.

The prefix defines the number of leading bits in an address that are compared to determine whether or not an address is part of a network.

在 3.14 版的變更: Made available on the class.

compressed
exploded

The string representation in dotted decimal notation. Leading zeroes are never included in the representation.

As IPv4 does not define a shorthand notation for addresses with octets set to zero, these two attributes are always the same as str(addr) for IPv4 addresses. Exposing these attributes makes it easier to write display code that can handle both IPv4 and IPv6 addresses.

packed

The binary representation of this address - a bytes object of the appropriate length (most significant octet first). This is 4 bytes for IPv4 and 16 bytes for IPv6.

reverse_pointer

The name of the reverse DNS PTR record for the IP address, e.g.:

>>> ipaddress.ip_address("127.0.0.1").reverse_pointer
'1.0.0.127.in-addr.arpa'
>>> ipaddress.ip_address("2001:db8::1").reverse_pointer
'1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa'

This is the name that could be used for performing a PTR lookup, not the resolved hostname itself.

在 3.5 版被加入.

is_multicast

True if the address is reserved for multicast use. See RFC 3171 (for IPv4) or RFC 2373 (for IPv6).

is_private

True if the address is defined as not globally reachable by iana-ipv4-special-registry (for IPv4) or iana-ipv6-special-registry (for IPv6) with the following exceptions:

  • is_private is False for the shared address space (100.64.0.0/10)

  • For IPv4-mapped IPv6-addresses the is_private value is determined by the semantics of the underlying IPv4 addresses and the following condition holds (see IPv6Address.ipv4_mapped):

    address.is_private == address.ipv4_mapped.is_private

is_private has value opposite to is_global, except for the shared address space (100.64.0.0/10 range) where they are both False.

在 3.13 版的變更: Fixed some false positives and false negatives.

  • 192.0.0.0/24 is considered private with the exception of