Actually... you can gain much information from the IP address of someone. It also depends on the user's ISP (Internet Service Provider), but it can be done. I had to find the address of a person threatening to hack my site once. I got his address and phone number from his IP address, using certain tools and what not. I am not saying this to scare anyone or anything, but just to let you know it can be done. That's why I browse with a proxy