CIDR to IP Range
Convert any IPv4 CIDR block into full network range and host boundaries. Use this online tool instantly.
About This Tool
This free online CIDR to Range converter turns CIDR blocks into exact start/end IPv4 ranges in seconds. Enter a value like 10.0.0.0/16 and get network, broadcast, first usable host, last usable host, and total/usable address counts. It is useful for subnet planning, ACL creation, and IP allowlist setup.
The tool runs completely client-side for speed and privacy. No account is required, and your input data is not stored on IO Tools servers. Use the output in network diagrams, cloud VPC documentation, firewall tickets, and troubleshooting notes.