CIDR to IPv4 converter

Handy converter: https://www.ipaddressguide.com/cidr

E.g. for the CIDR to IP Range using a CIDR Range of 10.10.20.0/26

means 64 IP addresses – the first being 0 and the last 33.

 

You can calculate this simply by adding up how many you need to get to 32 – i.e. 6.

Then 2^6 = 64.

So, the first would be 10.10.20.0 and the last would be 10.10.20.63.