This module uses the Berkerly database.  This database simply contains
IP blocks as keys, and countries as values.  The data is obtained from
the ARIN, RIPE, and APNIC whois servers.  This database should be more
complete and accurate than reverse DNS lookups.

This module can be used to automatically select geographically closest mirror,
or to target advertising by country, or to analysis your web server logs
to determine the countries of your visiters.

To find a country for an IP address, this module finds Networks
that contain the IP address, starting with a netmask of 32, going up to
3 until it finds a matching IP Block.

Copyright (c) 2001, T.J. Mather, tjmather@tjmather.com

All rights reserved.  This package is free software; you can redistribute it
and/or modify it under the same terms as Perl itself.