With this tutorial you can:
1. Find out someone's IP address when chatting on Skype, gTalk, Yahoo msngr or Facebook.
2. Find out if you have unauthorized activity on your PC.
3. Find out if someone is stealing your WiFi.
First of all make sure you clean your browsing data,cache and cookies, then open the CMD (Command Prompt) and type "Netstat -nbt" (without quotes).
Then, seek the established connections as described on the picture above and note down all the suspicious IP’s!
Note: Before launching the CMD make sure you close all the other tabs in your browser and only chat is open. Also if possible delete all the history and cache from your browser.
Additionally, you can open the task manager and under 'View' choose 'Select Columns'.
Then check the 'PID' (Process Identifier) column to see the process id of the applications running as active connections.
The final step is to trace that user using his IP address here