* If you have a wireless card, frequently you will have two ethernet card hardware addresses: An cable access ethernet card and a wireless ethernet card. Be sure to register the wireless hardware (MAC) address.

Hardware (MAC) Address

Windows 95/98/ME
Windows NT/2000/XP
Macintosh OS 9.x and older
Macintosh OS X


Windows 95/98/ME
Click Start and select Run. Then type winipcfg in the Open: field and click "OK."



Your hardware (MAC) address is displayed in the Adapter Address box:



Note: Make certain the Ethernet adapter is showing if you want the Ethernet adapter or Wireless Ethernet for the wireless card! Some computers may have more than one network adapter available. For example, a computer may have both an Ethernet adapter and a PPP adapter (for dial-up connections). You must display the address of the Ethernet adapter or Wireless Ethernet Adapter--by changing the selection in the drop-down box.
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Windows NT/2000/XP
Ethernet MAC
Go to the Start menu and select Run. In the text box, enter: cmd and click "OK."

At the prompt, enter: ipconfig /all.
The 12-digit number listed as Physical Address is the MAC address.

For example:

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : free.metrofi.com
Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
Physical Address. . . . . . . . . : 00-16-41-17-19-14

This is the hardwired port, the Ethernet adapter--not the PPP or any other adapter.

Wireless MAC

Ethernet adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Description . . . . . . . . . . . : Intel(R) PRO/Wireless 2200BG Network Connection
Physical Address. . . . . . . . . : 00-16-6F-0D-05-89

The 'Physical Address' is the internal wireless card MAC address.
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Macintosh OS 9.x and older
1. From the Apple Menu, select the Apple System Profiler.



2. In the Apple System Profiler box, look under Network Overview > Appletalk > Hardware Address to find out the hardware address of your computer.


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Macintosh OS X
Ethernet
Open the System Profiler application in the Utilities folder. Under the first tab on the left, called System Profile there is something like this:



"Ethernet address" is the hardware address.

You can also get this output by going to the Apple menu and selecting "About This Mac," and then pushing the "More Info..." button. That is a short-cut to getting to the System Profiler and a little easier than going to the Utilities folder.

AirPort
To find the MAC address of the AirPort device please do the following:
Apple -> System Preferences -> Network -> Show “airport” -> AirPort ID: xx:xx:xx:xx:xx:xx

Below is a screen shot, of the AirPort MAC address; this device is 00:16:cb:f2:d8:35.


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