IP Range to CIDR Converter

Enter two IPv4 addresses and summarize the interval as minimal CIDR notation with copyable results.

Start IPv4

End IPv4

ReadyProduces the smallest exact CIDR cover.

How to use this IP Range to CIDR Converter

Convert an IPv4 start/end range into the smallest exact list of CIDR blocks. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.