Okay, this is annoying. Help.

Every time I try joining the IRC chat, it kicks me out because it says my IP address is blacklisted. How the heck did my IP address get on any banned lists? And why? I was able to get in before by changing my IP address (release and renew), but that does not always work here. Proxies aren't allowed.

I'd appreciate some help. And I'd like to not have to deal with this every time I want to enter the IRC.