You wern't banned.  You're IPs/cd key/player should validate fine.  You just came in TeamSpeak with one of your IPs??  Something else is going on, if you can't get into our servers it isn't because of a ban.  Give me a screenshot of what you see in game when you try to enter our UT3 servers or give me the text you get when you try to enter our TeamSpeak server.  As far as I know it's a connection issue.

This is what you should get when you're banned from UT3

Your IP address has been banned on this server.
or
Your IP address has been banned from the current game session.
or
Banned CD Key.
or
You have been forcibly removed from the game.

If you don't get one of those messages then it isn't a ban.  Come on TeamSpeak if you can and I'll tell you who the cheater was.  There was no IP range ban- especially not a large range such as 74.*.