Alright guys, there's really no need to start offending eachothers. This is a marketing forum, so you need to start learning how to become more professional.
Regarding OP's question, if it was that easy to get people's IPs, then that'd cause lotsa problems of all sorts. IP addresses are burried deep down in the logs or tracking software and they are meant to be kept that way. However, some website owners still do stupid mistakes, giving outsiders access to these information. Oh yeah, care to explain why would you want such information? I can't think of any reason really