How to Find Your Computer's Ethernet (MAC) Address

In Windows NT/2000/XP

  1. Go to the Start menu, choose run.
  2. Type “cmd” and press Enter.
  3. A DOS window will open up. At the DOS prompt, type "ipconfig /all" and press Enter.
  4. Look under the "Ethernet adapter Local Area Connection" for the physical address for your wired connection, or under the wireless network connection for the physical address of the wireless connection.

In Windows Vista

  1. Click on the Windows icon in the lower left corner of your screen and type the word "command" into the start search box that appears at the bottom of the pop-up. Press enter.
  2. A DOS window will open up. Type in "ipconfig /all" and press enter.
  3. Look under the "Ethernet adapter Local Area Connection" for the physical address for your wired connection, or under the wireless network connection for the physical address of the wireless connection.

On a Mac OS 10.2

  1. Open the System Preferences and choose Network.
  2. Choose Built-in Ethernet from theShow drop down menu. You will find the Ethernet address in the TCP/IP tab

On a Mac OS 10.3 or 10.4

  1. Open System Preferences
  2. Open Network
  3. Open the Built-in Ethernet entry for your wired connection settings or Airport for your wireless settings.
  4. Click on the Ethernet tab for the Ethernet ID

On a Mac OS 10.5

  1. Open System Preferences
  2. Open Network
  3. Click on Ethernet for your wired connection settings or Airport for your wireless settings.
  4. Click the Advanced button
  5. Click the Ethernet tab for the Ethernet ID