GeoIPgen – Country-to-IPs generator. Geographic IP generator for IPv4 networks.
Latest Version 0.4, 7th March 2009
License BSD
Author Andrew Horton aka urbanadventurer, MorningStar Security

GeoIPgen is a country-to-IPs generator. It’s a geographic IP generator for IPv4 networks that uses the MaxMind GeoLite Country database.

Geoipgen is the first published software that uses a geographic ip database in reverse to translate from country-to-IPs instead of the usual use of IP-to-country to produce the complete set of IP addresses for a country. Previously software has generated IP address ranges so that entire countries can be blocked by a firewall and the technique used by geoipgen has been discussed before by the GNUcitizen researchers.