ipcalc - 0.51-1 main

ipcalc takes an IPv4 address and netmask and calculates the resulting
broadcast, network, Cisco wildcard mask, and host range. By giving a
second netmask, you can design sub- and supernetworks. It is also
intended to be a teaching tool and presents the results as
easy-to-understand binary values.
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Originally, ipcalc was intended for use from the shell prompt, but a
CGI wrapper is provided to enable colorful HTML display through a
webserver.
You can find it in /usr/share/doc/ipcalc/examples directory.