How Do I Find the MAC Address (Physical Address) of My PC?

Jacqueline Freeman - revised 08/2007

How do I find the MAC address (Physical Address) of my Ethernet adapter?

Assuming you use Windows XP (Home or Professional):
  • Click the Start button, select Run.


  • Type CMD and click OK.


  • A black Command prompt window will open. Type ipconfig /all and press Enter. (Note the space between ipconfig and /all.)


  • Lots of information will be displayed, but what you need is in the Ethernet Adapter Local Area Connection section. Write down the Physical Address that looks like "0A-B1-C2-D3-E4-F5". This is the "MAC Address."

    Your MAC Address (Physical Address) almost always starts with a zero. If you're writing down a number that does not start with "0" you've probably got the wrong number.


    Once you have written down your MAC (Physical) Address click the x-close or type EXIT to close the window.

  • Now you can go to to register your computer for internet access.


    • In Windows Vista the Start menu items look a little different but you're still looking for the Run command. If you can't find it, select All Programs, Accessories and click Command Prompt.

    • Make sure you have the right Ethernet adapter Local Area Connection. This is easiest during the "free-for-all" period at the beginning of each semester: a few lines below Physical Address find IP Address; if it starts with "149.72" you're probably looking at the right Connection. If IP Address is missing or starts with something else, look for Ethernet adapter Local Area Connection 2 or Ethernet adapter Local Area Connection 3, etc..

    • Your MAC address NEVER looks like 00-00-00-00-00-00-00-E0 (way too many zeros, and too many numbers) or 44-44-45-44-44-44 (that's your modem). It ALWAYS has 6 pairs of 2 numbers, like 01-22-C3-D4-E5-F6.

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