IP Range to CIDR Converter

Convert an IP address range (start IP → end IP) into the minimal set of CIDR blocks that cover the range

Quick Examples

About Range to CIDR

This tool converts arbitrary IP ranges into CIDR notation blocks:

  • Minimal set: Finds the smallest number of CIDR blocks
  • Aligned blocks: CIDRs respect network boundaries
  • IPv4 & IPv6: Supports both address families
  • Exact coverage: All addresses in range are included

Useful for converting firewall rules, ACLs, or vendor-provided IP ranges to CIDR format.