how to find ip adress while chat..

First you got to find out the IP address of that User.

To Do so we will be using “netstat” command in windows. If you want to know the IP address of a specific person on facebook or orkut or any chat service, there is only one way: Just invite or ping him for a chat and while chat is ON open ‘Command Prompt‘ on your PC (Start >Run>cmd).
note: before trying this make sure you close all the other tabs in your browser. and only facebook is open. also if possible delete all the history and cache from your browser.
When command prompt opens Type the following command and hit Enter.

netstat -an

And you will get all established connections IP addresses there. Note down all the suspicious IP’s

The Next Step is to Trace that user using his IP address.

To do so we will be using IP tracer service. Go to the below address and paste the IP address in the box that says “lookup this ip or website”. and it will show you the location of the user.

http://www.ip-adress.com/ip_tracer/

It will show you all the information about that user along with his ISP and a Location in the MAP. Now in the MAP Just click on “click for big ip address location” in the big picture you can actually zoom in. and try to recognize the area. If any serious matter just note down the ISP details in that page and contact them about the IP. they will respond you.