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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'
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The formula to calculate the number of assignable IP address to CIDR networks is similar to classful networking. Subtract the number of network bits from 32. Raise 2 to that power and subtract 2 for the network and broadcast addresses. For example, a /24 network has 232-24 - 2 addresses available for host assignment.
0.0 to 127.255. 255.255 , with a default mask of 255.0. 0.0 (or /8 in CIDR). This means that Class A addressing can have a total of 128 (27) networks and 16,777,214 (224-2) usable addresses per network.
CIDR notation is a compact representation of an IP address and its associated network mask. The notation was invented by Phil Karn in the 1980s. CIDR notation specifies an IP address, a slash ('/') character, and a decimal number.
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')]
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/
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