Hi,
Does any one knows how to get IP Address of the person against whom I am chatting?

Please reply

Depends on the application you are using.
Some you can easily and others you can't.

Yes. Why not ask them the other person for the info by having them surf to What Is My IP Address? - IP Address Lookup, Info, Speed Test, and more or many other similar sites. If your request is legit, I am sure they would provide you this info.

Because of the remote possibility of providing net stalkers with tools a/o knowledge to locate their "prey", I choose not to publicly post a specific answer to your question. I am sure you understand.