May 26, 2018
RFC 1878 subnet calculator / helper
cidr is a tiny command-line tool for determining network and broadcast addresses a la RFC 1878. It takes an IP address and netmask and outputs the network address, broadcast address, and total number of addresses for the corresponding subnet. The IP can be in binary, decimal, hex, or dotted quad. The mask can be in binary, decimal, hex, dotted quad, or prefix.