This tool has two modes: one for analyzing a CIDR block and one for converting a start/end IPv4 range into the smallest CIDR set possible.
How to use:
- For CIDR Analysis, enter a value like
192.168.1.0/24 and click Analyze CIDR.
- The result shows the normalized block, subnet mask, wildcard mask, network and broadcast addresses, usable range, and address counts.
- For Range to CIDR, enter a Start IP and End IP in IPv4 format.
- Click Convert Range to generate the minimal list of CIDR blocks that cover the full range.
- Use this when summarizing firewall rules, ACLs, routing ranges, or IPv4 allocation blocks.