Both services are blocking that type of info, since folks were using it in prior versions for malitions intent. So, during normal chat, no you can't tell.
But, if you can get a file transfer initiated between you and the other chat client, those run directly without running through a middleground server, so you could then use the NETSTAT suggestion from Answer1 to tell.
If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.
ip address
thanks