Just curious... Why would you want to ban an entire country?
For one of the sites I use to run, we were banning a lot of people from Brazil, Russia/Croatia, and China, because they were always trying to hack on the game the site was for.
After going through the ban logs for the game, and seeing several thousand different IP's from those locations (Together, not each), I decided that it was better to ban those countries to limit the amount of work that in game moderators would have to deal with.