WorldIP - free geolocation database, service and tools

In firewall it is possible to filter by country. It is very useful to block certain countries or to balance the requests to different backends, each of which handles its region.

Now WorldIP database exists in the format for geoip module from the extension package xtables-addons for iptables. Using this module, you can build more flexible rules for iptables, based on IP-geolocation.
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Thanks to Craig MacKenna, there is the module IP::World for WorldIP base in CPAN.
Today it is the fastest module for access to IP database. At Athlon64 2.4GHz are 236K req/sec; XEON E5405 2Ghz - 267K req/sec
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