FTP connection to get IP

Ok, i havent been on in probably a year but with a recent computer class I got pumped up again about security issues. Here is my question though: when i am on AOL or AIM and i have someone direct connect with me, what is the command in DOS i go to to see the IP address of a computer that is connected to me. I cant remember, i used to know it. If the question isnt clear, just tell me.
Thanks

netstat will show you all connected machines/addresses...
use the "a" switch...

I use

netstat -an

or you can use netstat -a

Those two commands will show you the IP and port number connected to your Computer

edit/
Damn just a couple seconds to late tampabay

Thank you very much, i kept using nbtstat and not netstat. Thanks for being so quick!

nbtstat is for NetBios stuff.