We’ve added a new IP Range to CIDR Converter.
- Range → CIDR: Enter a start and end IP to get the exact list of CIDR blocks that cover that range.
- CIDR → Range: Enter a CIDR to see the start-to-end IP range it covers.
- Merge CIDRs: Enter several adjacent CIDRs and get them summarized into fewer, larger blocks — great for trimming down firewall rules.
- Paste-ready copy: Copy the result as newline- or comma-separated text, ready to drop into firewall or cloud security group rules.
- All calculations happen entirely in your browser — nothing you enter is sent to or stored on a server.