SubnetLeaf

Check an IPv4 CIDR range in your browser

Enter an IPv4 block such as 192.0.2.37/24. SubnetLeaf shows its network, first and last address, subnet mask and exact address count. Nothing you type leaves this page.

Four numbers from 0 to 255, a slash and a prefix from 0 to 32. No spaces.

One IPv4 address, for example 192.0.2.100.