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Hardware addresses

About

The hardware address (also known as the Ethernet, physical, or MAC address) is a 12 byte hexadecimal number that is unique to the Ethernet card on your machine It will often be displayed in one of the following formats:

  • 08:00:2B:BC:31:DC
  • 08-00-2B-BC-31-DC

Sometimes leading 0's are omitted. For example, 08-00-2B-BC-31-DC and 8-0-2B-BC-31-DC refer to the same hardware address.

How to determine your computer's hardware address

On a computer running Windows 7

  1. Press the Start button, type cmd, then press Enter to start up a command shell
  2. Type ipconfig /all
  3. The hardware address will be listed under "Physical Address"

On Mac OS X

  1. Select "System Preferences" from the Apple Menu.
  2. Select Network
  3. Select your Ethernet adapter from the menu on the left
  4. Click the Advanced button
  5. Click the Hardware tab
  6. The hardware (MAC) address will be shown below.

On Linux

  1. Run /sbin/ifconfig -a
  2. The hardware address for each Ethernet interface will be listed in the output after the string "HWaddr".

On Solaris

  1. Become root.
  2. Run /usr/sbin/ifconfig -a
  3. The hardware address for each Ethernet interface will be listed in the output after the string "ether".