Country Blocks
Country IP Blocks: Network Allocations by Country with Searchable IP Database.
Country IP Blocks helps you take control of your internet traffic!
Country IP Blocks now offers Network Data in 7 Distinct Formats: CIDR, Netmask, .htaccess deny, .htaccess allow, IP Range, Decimal/CIDR* and Hexadecimal/CIDR. You decide who can access your websites and servers. Block a country, allow a country. Now you can take complete control of your website and network traffic. IP Blocks are a simple and effective way to improve security by limiting spammers, hackers, bandwidth wasters or malicious traffic.
The current checksum for each country/format is available on the above pages and we will soon have Country Database and format specific RSS feeds to help you better automate your update processes.
I have to say, this is a very nice site. You have a wel setup database and format.