On a Windows host, the ipconfig /all command can be used to identify the MAC address of an Ethernet adapter. In Figure 1, notice the display indicates the Physical Address (MAC) of the computer to be 00-18-DE-C7-F3-FB. If you have access, you may wish to try this on your own computer.

Depending on the device and the operating system, you will see various representations of MAC addresses, as displayed in Figure 2. Cisco routers and switches use the form XXXX.XXXX.XXXX where X is a hexadecimal character.