Okay. Short and sweet - when you replace a computer and you use Mediacom High Speed Internet, you have to go to this one website and register that machine with them to be able to access the internet, even if all you really did was change ethernet cards. At that point, you get a new IP.
Anyway, I did that earlier tonight and now whenever I connected to a given IRC net, all it shows is my IP, and not a proper reverse DNS entry like always before. Help!