SUBNET CALCULATOR

Subnet ID, Broadcast, Host addresses, Wildcard mask and class bit usage bitmap are provided as calculation results;... To use: Input IP Address in dotted-decimal format (e.g. 10.0.0.1). Classful calculation is based on classful network addressing architecture. Classful networking was used until the introduction of CIDR (classless inter domain routing). Calculations are given instantly when typing. Invalid input gives no results. Calculator will assume that unfinished IP addresses end with zeros. Network class will be determined automatically. Only Network classes A,B and C will calculate results. For classes network calculations, please use CIDR calculator, for route aggregation, please use Supernet calculator... Select Mask in dotted-decimal format or by adjusting network bits or max sub-networks you want.

Also known as: Subnet-Calculator.org