finding ip range via subnet mask

Question

Let's say my local ip is 10.212.97.23 and my Subnet Mask is 255.255.254.0

According to that, I'm in the same subnet with 10.212.96.* and CIDR would be 10.212.96.0/23

So my question is: Is there any python library which takes local ip and subnet mask and calculates the CIDR value? I checked netaddr library but couldn't find this functionality

Answer 1

The basic count in CIDR can be computed manually using the below function without using any libraries:

>>> netmask = "255.255.254.0"
>>> sum([bin(int(x)).count("1") for x in netmask.split(".")])
23

Let me know if it is helpful.

Answer 2

If you want to do it with a module, the ipaddress module can help:

❯ python3
>>> import ipaddress
>>> ipaddress.IPv4Network("10.212.97.23/255.255.254.0", strict=False).prefixlen
23

Docs here .