To find out the MAC (Media Access Control) Adapter Address for your Ethernet or wireless network card, follow the instructions below that pertain to your computer's operating system.

I. Windows Operating Systems
II. Macintosh Operating Systems
III. PDA Operating Systems

Note: MAC/Adapter Addresses are in the form of: yy:yy:yy:yy:yy:yy
They do not, however, begin with 44, as in this example: 44:yy:yy:yy:yy:yy

I. Windows Operating Systems

Windows Vista
Standard Ethernet Card
1. Click on the Start button.
2. In the Search box, type cmd and press Enter.
3. When the command prompt appears, click on the maximize button in the upper-right corner of the window.
4. At the command prompt, type: ipconfig /all and press Enter.
5. Locate the heading, Ethernet adapter Local Area Connection. Under this heading, there will be an item listed as Physical Address. The combination of twelve letters and numbers shown next to the Physical Address is the MAC address.

Wireless Network Card
1. Click on the Start button.
2. In the Search box, type cmd and press Enter.
3. When the command prompt appears, click on the maximize button in the upper-right corner of the window.
4. At the command prompt, type: ipconfig /all and press Enter.
5. Locate the heading, Wireless LAN adapter Wireless Network Connection. Under this heading, there will be an item listed as Physical Address. The combination of twelve letters and numbers shown next to the Physical Address is the MAC address.

Windows XP
Standard Ethernet Card
1. Click on the Start button and select Run.
2. In the Open box, type the following: command
3. Click on OK. The command prompt will appear.
4. At the command prompt, type: ipconfig /all
5. If your computer has an Ethernet card or Ethernet adapter, the last section will be listed as Ethernet Adapter. Under this section, there will be an item listed as Physical Address. The combination of twelve letters and numbers shown next to the Physical Address is the MAC address.

Wireless Network Card
1. Click on the Start button and select Run.
2. In the Open box, type the following: command
3. Click on OK. The command prompt will appear.
4. At the command prompt, type: ipconfig /all
5. If your computer has a wireless network card, information will appear under Ethernet adapter Wireless Network Connection. Under this section, there will be an item listed as Physical Address. The combination of twelve letters and numbers shown next to the Physical Address is the MAC address.

II. Macintosh Operating Systems

OS X
Standard Ethernet Card
1. Click on the Apple icon in the top left corner of the screen and select System Preferences.
2. In the Internet & Network section of the System Preferences window, click on the Network icon.
3. In the Network window, click on the Show box and select Built-in Ethernet.
4. Click on the Ethernet tab and the combination of twelve letters and numbers to the right of Ethernet ID is the MAC Address.

Wireless Network Card
1. Click on the Apple icon in the top left corner of the screen and select System Preferences.
2. In the Internet & Network section of the System Preferences window, click on the Network icon.
3. In the Network window, click on the Show box and select AirPort.
4. The combination of twelve letters and numbers to the right of AirPort ID is the MAC Address.

III. PDA Operating Systems

Pocket PC (iPAQ)
1. Tap on Start and select Settings.
2. Tap on the System tab on the bottom of the screen.
3. Tap on the iPAQ WLAN icon.
4. Tap on the Status button.
5. The MAC address is listed near the bottom of the screen.

Palm Tungsten C
The MAC address should be listed on the back of the unit under the serial number. If you don't see it, you can obtain the MAC address as follows:

1.In the Applications launcher, tap on Prefs.
2. In the Communications section of the Preferences screen, tap on Wi-Fi.
3. Tap on Info.