To find the ethernet hardware address of a device, please check the following based on your environment. 

For Windows NT/2000/ME/XP computers

1. Click on the Start button, and then click on Run...
2. This will bring up a small window where you can enter a line of text. Type in the word command and click the OK button.
3. A black window should pop up. If you get an error message instead, try typing in c:\winnt\command.com in the step above. 
4. In the black window, type in ipconfig /all and hit return. It should come up with a list of information. 
5. Look for the line called Physical Address. Your ethernet hardware address is the set of numbers and/or letters across from the Physical Address.  

For Mac OS X computers

1. Go to the Apple Menu and choose "System Preferences."
2. Click on "Network."
3. Click on the "Advanced..." button.
4. Click the "Ethernet" tab in the new window that displays.
5. The ethernet hardware address is listed as the set of numbers and/or letters next to "Ethernet ID."