I do not currently fully understand relationship between binary numbers and ip addresses and subnet addresses; nor am I asking for an explanation here at LQ, when there are plenty at wikipedia and other places...

Even after reading the wikipedia article on it, I still don't grasp it completely, so I was hoping that someone who grasps it in its entirety could answer a simple question.

How can I express the range of ip addresses from 172.22.22.200 - 172.22.22.230 ?

I was trying to make a rule for iptables that only did nat on that specific range of ips, and when i tried used the "-s" flag followed by 172.22.22.200/11 it always changes to 172.0.0.0/11 in the actual rule that is created and displayed by iptables -t nat -L.

I already have many hosts defined on my network, and rather than going through each one and changing its ipaddress to 172.0.0.#, I was hoping to learn a way to represent them in the iptables rule.

http://www.subnet-calculator.com/cidr.php

Which is correct. An /11 is very big.

200 and 230 are odd. The best you can get is 172.22.22.200/26 which is 172.22.22.192-172.22.22.255, or 172.22.22.200/29 and 172.22.22.208/29 and 172.22.22.216/29 and 172.22.22.224/29.

1 members found this post helpful.

Thankyou AlucardZero. The 172.22.22.192/26 works well for my needs, and saves me having to reassign many of the static ips on my LAN.