motorhaven - 1:05 pm on Dec 13, 2012 (gmt 0)
A heads up:
I have known legit users at:
(All single IPs, I can stickymail the exact IPs if someone needs them)
Know they are legit users because they are long time posting (not spammers) members of an established forum.
So there are corporate gateways in those ranges. I block some of them, just a finer level to avoid blocking real visitors.