CIDRAM

IPv4 subnet utility

Expand CIDR subnets into usable IP addresses...

Enter one IPv4 subnet per line. CIDRAM will normalize each subnet, remove duplicates, and generate its usable host addresses locally in your browser.

Separate entries with line breaks, commas, spaces, or semicolons. IPv4 only.

How are usable addresses handled?

For traditional IPv4 subnets, the network and broadcast addresses are excluded. A /31 returns both addresses for point-to-point use, while a /32 returns its single address.

To keep the browser responsive, this version limits a single expansion to 250,000 generated addresses.