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How do I lookup the MAC address of my computer?


2.0 - Updated on 2018-10-03 by David Lee

1.0 - Authored on 2014-02-27 by Paula Shimada

For various reasons (including registering a system), the MAC address of a computer may need to be noted and the procedure to do so in many popular systems is relatively simple.

How to look up the local MAC address:

Microsoft Windows (7, 8 and 10)

  1. Open the Start Menu.
  2. Click on Run
    • In Windows 7 & 8 enter cmd in the search field
  3. Type in cmd
  4. Click on OK
  5. From the command prompt, type in:
    • ipconfig /all
  6. Press enter
  7. Note the Ethernet adapater Local Area Connection: header
    • One may need to scroll up in the command prompt.
  8. Locate the Physical Address. . . . . . . . . field
  9. Note the six pairs of numbers / letters to the immediate right of this area.
    • Ex. address: D4-BE-D9-8D-2D-61

Mac OS X
  1. Click on the Apple Menu / icon in the top left hand corner.
  2. Click on System Preferences from the drop down menu.
  3. Click on Network (located under the Internet & Wireless header).
  4. In the left hand pane, select the currently connected network.
    • Ethernet denotes a wired connection & Wi-Fi denotes a wireless.
      • A green dot will appear to the immediate left of whatever connection is active.
      • If you are registering your MAC Address with the campus DHCP registration, be sure to use the ethernet/wired MAC address
  5. Click on the Advanced button in the lower right hand corner of the pane.
  6. Click on the Hardware tab.
  7. Note the number to the immediate right of the MAC Address: field.

For additional assistance, contact CSS IT at 510-664-9000 and follow the prompts to reach a technician from between 8 am to 5 pm, Monday through Friday. A ticket may also be submitted through or by e-mailing