Create CIDR Ranges from Network Blocks

Our CIDR Calculator takes a starting network address and the number of hosts assigned to the address block and creates the fewest number of legal subnets or supernets within the assigned network block. Correct output is produced only when a legal network address and number of hosts are entered into the form. For example: if you have a block of networks comprising the range 136.1.0.0 - 136.140.255.255, your network address or Starting IP is 136.1.0.0 and your number of hosts is 9175040.

Entering a Starting IP of 136.1.0.0 and 9175040 as the Number of Hosts will produce CIDR output of 136.1.0.0/16, 136.2.0.0/15, 136.4.0.0/14, 136.8.0.0/13, 136.16.0.0/12, 136.32.0.0/11, 136.64.0.0/10, 136.128.0.0/13, 136.136.0.0/14, 136.140.0.0/16. Give it a try.