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'

Answer 1

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')]

Answer 2

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/