Turkey, Romania, China, Russia and India. There are websites where you can get lists of the IP ranges per country to make it easy to block. There were some from other countries as well, including from the US, so I could block just a smaller range of IPs to stop those. We would get between 100-300 fake signups a day posting virus links, trash, porn, scams, every day... blocking IPs got it down to maybe 2 or 3 a month.
