CODEWITHSUNDEEP
pythonipsubnetcidr
MoMoney
MoMoney

Reputation: 1214

Python Lowest Common CIDR

Say I have two IPs: startip = '63.223.64.0' and endip = '63.223.127.255'

I understand that in python netaddr.iprange_to_cidrs(startip, endip) will give you a list of CIDR subnets that fit exactly between the boundaries. However, I was hoping to go for one CIDR subnet that covers it all even if it gives a few more IPs.

I prefer a function that does it, but I would also welcome any math/logic to calculate it and eventually turn it into code.

Upvotes: 1

Views: 896

Answers (2)

Robᵩ
Robᵩ

Reputation: 168626

It looks like netaddr.spanning_cidr does the trick:

In [5]: netaddr.spanning_cidr(['63.223.64.0', '63.223.127.255'])
Out[5]: IPNetwork('63.223.64.0/18')

Upvotes: 1

Simon Fraser
Simon Fraser

Reputation: 2818

Have you tried the ipaddress module? It comes with Python 3, but is installable for Python 2. 

import ipaddress
startip = ipaddress.IPv4Address('63.223.64.0')
endip = ipaddress.IPv4Address('63.223.127.255')
# summarize_address_range produces a generator, so force the results
networks = [n for n in ipaddress.summarize_address_range(startip, endip)]
print(networks)
# [IPv4Network('63.223.64.0/18')]

Upvotes: 3

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