The iprange tool is handy for transforming network range formats, but
it's common to need a tool for running quick checks on the output.
The tool now supports a list of addresses on the command line, and it
will only output those which match. It's absolutely inefficient but is
handy for debugging.
This tool has remained uncommitted in my development tree for almost a year.
Just minor polish and commit.
It can be used to convert some geolocation IP lists to ACLs.