Country IP Blocks was created as a resource to protect servers, systems and websites from spam, malware, cross-site scripting, website hijacking, hacking, cracking and other malicious activities. When properly implemented, using our network data in your security scripts, firewalls, Access Control Lists or .htaccess files will dramatically improve your I.T. security.
The Country IP Database
Our database contains up to the minute network information on nearly 250 countries worldwide. We provide the data free of charge in CIDR and Netmask format.
We Update Our Database Daily
Our Country IP Database was designed with two goals in mind: Accuracy and availability. The database is derived directly from the Registry sources and is updated as often as the Regional Registries provide new or altered network allocations. This means we update our entire Country IP Database at least daily or more often as required.
More info and download addresses from http://www.countryipblocks.net
Also look at generating IPtables blocklists with a automated web based script at http://blacklist.linuxadmin.org