That can't be it, because that's the IP he posted from in his last message. Thus, it couldn't be banned if he's posting from it.67.159.44.138. This is it, I believe. I checked the IP ban thread and it wasn't in there, but I don't have access to the list of banned IPs, so we have to wait until Irish can check, or Shocky gets full access.
What you need to do, Holy Hidden Dragon, is get to your computer that has the IP ban, and check your IP address. You can do this by opening your "Command Prompt" (or it may be called "MS-Dos"). Once you have this open, type "ipconfig", without the quotation marks, of course.
However, if you connect to the Internet through a router, this will not work for you. The ip address that is returned will be the router IP address. You can do one of two things. 1) Disconnect the Internet from your router, and plug your Internet directly into your computer. OR 2) Type in your router IP address into your Internet Browser, and find your service provider's IP address in your router menu. Where to find it will depend upon your router, I believe.
If you have a straight connection from modem to computer, then you shouldn't have any problems.
EDIT: There's possibly another option, depending upon who your Internet Service Provider is. If you wish to know this other method, please PM me. Do note, that it's more time consuming than the other options, and probably won't be necessary if you can figure the above out. But, it is still an option.