Should you want to find your current Internet IP address you would have to look in your router settings or go to this site or similar. The page also lists the procedure detailed by Tremmor, for Win and Mac.
for the record the ipconfig /all will show a physical addy this is also your mac.
Or you can type 'getmac' from the run command at start run.
just sharing.
If I go to Run and type ipconfig or ipconfig /all < I see a black DOS box for a fraction of second and then its gone, I must be doing something wrong. It was easy in XP