ipcalc provides a simple way to calculate IP information for a host.
The various options specify what information ipcalc should display
on standard out. Multiple options may be specified. An IP address to
operate on must always be specified. Most operations also require a
netmask or a CIDR prefix as well.
Display the broadcast address for the given IP address and netmask.
Display the hostname for the given IP address.
Calculate the netmask for the given IP address. It assumes that the IP
address is in a complete class A, B, or C network. Many networks do
not use the default netmasks, in which case an inappropriate value will
Show the prefix for the given mask/IP address.
Display the network address for the given IP address and netmask.