IP Range to CIDR conversion in Python?

Question

How can I get a CIDR notation representing a range of IP addresses, given the start and end IP addresses of the range, in Python? I can find CIDR to IP Range but cannot find any code for the reverse.

Example of the desired output:

startip = '63.223.64.0'
endip = '63.223.127.255'

return '63.223.64.0/18'

Asked By: Chris Hall

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Source

Answer 1

You may use iprange_to_cidrs provided by netaddr module. Example:

pip install netaddr

import netaddr
cidrs = netaddr.iprange_to_cidrs(startip, endip)

Here are the official docs: https://netaddr.readthedocs.io/

Answered By: ρss

Answer 2

Starting Python 3.3 the bundled ipaddress can provide what you want. The function summarize_address_range returns an iterator with the networks resulting from the start, end you specify:

>>> import ipaddress
>>> startip = ipaddress.IPv4Address('63.223.64.0')
>>> endip = ipaddress.IPv4Address('63.223.127.255')
>>> [ipaddr for ipaddr in ipaddress.summarize_address_range(startip, endip)]
[IPv4Network('63.223.64.0/18')]

Answered By: MichielB

Answer 3

If, like me, you want only 1 cidr (instead of multiple cidr’s) you’ll need to use the spanning_cidr function from either netaddr

pip install netaddr

from netaddr import spanning_cidr
spanning_cidr(startip, endip)

or spanning_cidr

pip install spanning-cidr

from spanning_cidr import spanning_cidr
spanning_cidr([startip, endip])

Here is the difference…

>>> from ipaddress import IPv4Address, summarize_address_range
>>> from netaddr import spanning_cidr
>>>
>>> startip = IPv4Address('63.223.64.0')
>>> endip = IPv4Address('63.224.127.255')
>>> list(summarize_address_range(startip, endip))
[IPv4Network('63.223.64.0/18'),
 IPv4Network('63.223.128.0/17'),
 IPv4Network('63.224.0.0/17')]
>>>
>>> spanning_cidr(startip, endip)
IPv4Network('63.192.0.0/10')

Answered By: reubano

IP Range to CIDR conversion in Python?

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