IPv4 CIDR Set Analyzer & Route Summarizer

Normalizes an IPv4 CIDR list, flags duplicates and covered routes, and computes the smallest safe exact aggregate list from the pasted addresses.

Runs locally in your browser

IPv4 CIDR listOne IPv4 address or CIDR block per line; an address without a prefix is treated as /32.

Local route mathValidate policy before publishingIPv4 only

This performs address arithmetic only. It does not query BGP, DNS, firewalls or cloud route tables.

Input blocks

No valid IPv4 blocks to display yet.

Aggregate blocks

No aggregate routes to display yet.