CIDR Calculator

Enter an IPv4 address with a CIDR prefix to get the subnet mask, network and broadcast addresses, and the usable host range. Everything is calculated live as you type.

IP address with CIDR

Supported: 192.168.1.10/24, 10.0.0.1/8, 172.16.0.1/12 … /0–/32. A bare address is treated as /32.