Although they are sometimes confused, the Ethernet address and the IP address are two different things. An Ethernet address is a built-in connection in a computer that never changes, whereas an IP address is prone to changing, particularly if you are using a laptop. The IP address depends on the location where you are connecting to the Internet. However, once you locate the Ethernet address, you can know this address will never change.
Click "Start" and type "Run" in the "Search" box.
Enter "IPCONFIG /ALL" into the "Run" box and press "OK."
Find the "Ethernet adapter Local Area Connection" section of the screen that appears. Then locate the nearby "Physical Address." The number listed next to "Physical Address" is the Ethernet address.