Macintosh OS X (10)

1. Open the System Preferences (in the Apple menu.)
2. Click the Network icon.
3. Click on Built-In Ethernet
4. Under the Ethernet Tab, the address is shown as "Ethernet Address ID "

Windows 2000/NT/XP || On NT workstations, Windows 2000, and Windows XP.

1. Go to the start and select Run.
2. Type: command
3. Type ipconfig /all
4. The Adapter address is displayed as machines Ethernet Address.

Windows Vista

1. Click on the Start menu, and select Control Panel.
   (You may need to choose Settings before Control Panel, depending on your Start Menu configuration.)
2. Click on Network and Internet.
   (Skip this step if you do not see this Control Panel item.)
3. Click on Network and Sharing Center.
4. Click on Manage network connections on the left side.
5. Double click on Local Area Connection .
6. Click on the Details button.
7. The Hardware Address is labeled Physical Address.

Windows 98/ME

1. Go to Start and select Run
2. Type winipcfg
3. Make sure that your Ethernet adapter is selected from the drop down list, and NOT any other adapter.
   

Note: To use the winipcfg program both your Ethernet card and TCP/IP must be properly installed.

An example of an invalid address in Windows 98 is 44:45:53:54:00:00. If you see this, you may have the PPP adapter selected in winipcfg. If your Ethernet card is not listed, then you do not have the card installed correctly.

MacOS 9.2 and lower

1. Go to the TCP/IP control panel.
2. In the edit menu, choose USER MODE.
3. Choose Advanced of the three choices. Click OK.
4. Click on the INFO button.
5. The address will appear in the TCP/IP window.

What is a Adapter address?

The adapter address is your Ethernet card’s unique identity - a 12-byte hexadecimal number containing 12 digits, each digit being a number 0-9 or a letter A-F (Example: 0040051c0e9f).

It may be referred to as either a hardware, Ethernet, or MAC (medium access control) address and might appear as:

digits separated by a colon:
00:40:05:1c:0e:9f
digits separated by a dash:
00-40-05-1c-0e-9f

Why do you need to find this address?

An Ethernet card transmits its address with each packet of data. Your assigned network port will be configured to allow only your hardware address to pass through. If you do not record the correct address, you cannot access the network.