You know you can always use proxys and avoid having your IP address seen; you could call your ISP and request to change the IP unless it's static (which you might have to pay to change it), if your IP is dynamic, you can unplug the power from your modem for about 35 seconds and plug it back in to allow your machine to aquire the new address.
As someone mentioned your router assigns you an IP as well, you can always change it in your router's configuration.
I recommend using proxys or annonymizer services. Almost all applications now support proxy use and you can find 1000s of them online for free.
