How do I find my computer's hardware (MAC) address?


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

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.

For 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!  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--by changing the selection in the drop-down box.

For Windows NT/2000/XP

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 El90x7:

        Description . . . . . . . . . : 3Com EtherLink PCI
        Physical Address. . . . . . : 00-00-00-15-89-EE

Again, be sure you get the number for the Ethernet adapter--not the PPP or any other adapter.

For Macintosh OS 9.x

To find your Apple computer's hardware address: 

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. 

For Macintosh OS X

(thanks to Anthony Hess and Joel Snyder)

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.