There's no such tools that yahoo messenger is using to trace the IP of the person you are talking with. Even though we know the names of the person who are always talking with us, there are times that you have unknown person talking to you in yahoo messenger or in any other internet messenger services.
And a lot of people is looking for this software for their privacy and security.
Download Process Explorer. Run your messenger software and run Process Explorer. Highlight messenger's process in Process Explorer and double click on it. Now click on the TCP IP tab, that will show you all the active connections of the program
here's a download link.
you can also use
netstat anyway... go to your command prompt and type
netstat. It will show you all active internet connections.
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