How to find ethernet address in Windows NT/2000/XP.

1.Click the Windows NT/2000 Start button and select Run. Type command and then click OK.
 

2.At the C:\ prompt, type ipconfig -all and press the Enter key on your keyboard.
 

3.The next screen displays information about your Ethernet adapter local area connection. Make sure you get the local area connection, not the wide area connection.Your twelve-digit, hardware Ethernet address is in the Physical Address field. In the following example, the Ethernet address is 00-C0-4F-74-F7-F0.
 

 
Note: we have had a rash of registration requests for the following address: 00:53:45:00:00:00, this is not a valid adapter address, please be sure you are getting the local area connection and not the wide area connection.