One of the things I did after getting iptables tweaked, was to clear my /etc/hosts.deny file. About 99% of these were put there by DenyHosts. Which is a great little background daemon that looks for failed log in attempts over ssh and then blocks the attacker by adding them to the /etc/hosts.deny file.
Since I know some people are looking for these types of addresses for different reasons, and there are over 2300+ unique ones in the list, I shared it publicly. You can get the list at pastebin.