IPv4 Subnet Calculator

Enter an address in CIDR notation, e.g. 192.168.1.0/24.

Unlike the IPv6 calculator, this calculator runs the calculation on the server — the CIDR address you enter is sent to our API to compute the result (it is not stored or logged anywhere).

Need a full router or switch configuration (WAN, NAT, DHCP, firewall)? Use the Device Configuration Generator.

See also: IPv6 Subnet Calculator.