ADDED:
* num-addrs subcommand, to get the number of hosts/addresses in a given
prefix length
* get-net subcommand, to more easily get a single subnet from either the
beginning or the end of a prefix. (MUCH FASTER than CIDR-splitting!)
ADDED:
* num-nets subcommand' this is MUCH much faster than actually splitting
if you're trying to figure out how many times a given subnet fits into
a network.
