Verify IP string is greater or less than another IP string in python

Question

In a sample code I am taking start IP and end IP as input . Out of which I will create a list of IP pool. I want to add a validation that start IP should be always lesser than end IP.

start_ip = '100.71.9.98'
end_ip = '100.71.9.100'

start_ip < end_ip 

False

How can I validate that start_ip should be lesser than end_ip ?

Asked By: Amby

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Source

Answer 1

Convert the strings to a list of ints.

>>> start_ip = '100.71.9.98'
>>> end_ip = '100.71.9.100'
>>> map(int, start_ip.split('.'))  # list(map(int, ...))  in Python 3.x
[100, 71, 9, 98]
>>> map(int, end_ip.split('.'))
[100, 71, 9, 100]

Then, it’s possible to compare them as you want:

>>> '100.71.9.98' < '100.71.9.100'
False
>>> [100, 71, 9, 98] < [100, 71, 9, 100]
True
>>> map(int, start_ip.split('.')) < map(int, end_ip.split('.'))
True

Answered By: falsetru

Answer 2

If you use Python 3.x then you can use the ipaddress stdlib package which has objects designed for ip addresses. These objects support comparison in this way.

import ipaddress

start = ipaddress.IPv4Address('100.71.9.98')
end = ipaddress.IPv4Address('100.71.9.100')

print(start < end)
# True

py2-ipaddress can be used (with some reduced functionality) if you are using Python 2.7.

Answered By: Ffisegydd

Answer 3

Standard ipaddress libray (IPv4/IPv6 manipulation library) works like charm:

import ipaddress 

if ipaddress.ip_address('192.0.2.1') < ipaddress.ip_address('192.0.2.2'):
    ...

Answered By: Antonio

Verify IP string is greater or less than another IP string in python

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