IP to CIDR

Convert IP addresses to CIDR online

Convert online IP range to CIDR specification. It's useful for Apache web server or Nginx administrators and give them a possibility to easy manage domain access by using allow and/or deny access direcive. Especially if it requires to put a lot of IP addresses. Each IP range is converted to the minimal list of CIDR blocks.

List of IP addressesExample:
192.168.0.1,192.168.1.15

Max. 1000 lines per request
Line prefix