Description:

This module allows you to check an IP address against one or more IP ranges.
It employs Perl's highly optimized regular expression engine to do the hard
work, so it is very fast. It is optimized for speed by doing the match against
a regexp which implicitly checks the broadest IP ranges first. An advantage is
that the regexp can be computed and stored in advance (in source code, in a
database table, etc) and reused, saving much time if the IP ranges don't change
too often. The match can optionally report a value (e.g. a network name) instead
of just a boolean, which makes module useful for mapping IP ranges to names or
codes or anything else.