A subnet is a logically visible subdivision of an IP network. The practice of dividing a network into subnetworks is called subnetting. More informations on Wikipedia

This tool will help you to compute information about IP subnetting. It's easy to use. In the following form you can enter differents addresses formats:

Description Format
IP & CIDR Netmask
IP & Netmask
IP & Wildcard Mask

The behavior of this application is the same that the ipcalc binary of GNU/Linux system's !

IP & mask or CIDR: