whatmask

Convert between common subnet mask notations

Whatmask is a small C program that will help you with network settings. It displays the following information given IP address and/or netmask: - The netmask in the following formats: CIDR, Netmask, Hex, Wildcard Bits - The Network Address - The Broadcast Address - The number of Usable IP Addresses - The First Usable IP Address - The Last Usable IP Address