How can I work out how many IP addresses there are in a given range?

Posted by Jarede on Programmers See other posts from Programmers or by Jarede
Published on 2014-05-29T11:54:07Z Indexed on 2014/05/29 15:52 UTC
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I'm wondering if there is a formula to work out the amount of IP addresses in a given range.

I have a system that takes either a single IP address or a start and and end IP address:

A single one might be: 145.16.23.241
A range might be: 145.16.23.122 - 145.16.23.144

The people inputting these aren't technical, nor are they receiving these details from technical people, so suggesting using CIDR notation isn't an answer for me.

I want to be able to highlight that when entering a range such as: 122.100.10.12 - 128.10.200.140 it might not actually be a range and rather 2 singular IP addresses since such a range would comprise of x (large number of) IP addresses.

Is there a basic formula to help me highlight this?

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