Throwing some IPs around in Python Part I

06 Jun 2017

I started to mess around with some IP addresses in Python, and I wanted to create a simple subnet-calculator where the user enters an IP and CIDR mask, ‘10.208.20.1/25’ and the program outputs the following information:

Here is what I have so far……

First of all, get some user input, and cut it up into an ‘ip’ and a ‘mask’ variable

# get the user to enter an IP/mask and add it to variable y
>>> y = input('Enter an IP address & mask, example 10.100.23.1/23: ')
Enter an IP address & mask, example 10.100.23.1/23: 200.54.23.1/24
>>> 
>>> y
'200.54.23.1/24'

# Split the y variable on the '/' character
>>> ip,mask = y.split('/')
>>> 
>>> ip
'200.54.23.1'
>>> 
>>> mask
'24'
>>>

So now we have the two parts of the network, in two seperate variables. Next up is splitting into octets, then doing some binary conversions to get the info we need.

Update - 05th September 2017

After being slack over summer I added this mini project/script as a repo on github, and called it ‘ip-snake-oil’. I’ll get a new blog post to cover the next steps on here soon.