hi paul,
first of all which OS are you using?
bt i had posted for both XP and Vista.....
I had someone stop by the site recently looking for information on how to find their network card's MAC address, also known as a physical or hardware address. I realized that it's it's easiest to get the MAC address via the command line. In Windows, the command is ipconfig /all, while Mac OS X users would type ifconfig into the Terminal application.
for windows XP
Finding your MAC address in Windows XP is easy with the command prompt. Click Start->Run and then type cmd and press enter. When you see the CMD window, type ipconfig /all. You may see a few Physical address entries here, but the one you're looking for will include an IP address, while the other ones probably won't.
To find your MAC address in the Windows XP GUI, open Control Panel by clicking Start->Control Panel
Double-click the Network Connections icon, then right-click your network connection and click Status. Your network connection is usually named Local Area Connection if you're connected to a wired network.
Click the Support tab and then the Details... button and a dialog will show your network connection's MAC address, along with other relevant connection information.
for windows vista
Like Windows XP, Vista makes it easy to get your MAC address via the command line. Click Start, type cmd into the Start search box and then hit the Enter key. Type ipconfig /all in the CMD window and look for the entry that includes an IP address. The physical address is your MAC address.
In the Vista GUI, you'll need to click the network icon in your Windows system tray, also known as the notification area. On a wired network, the icon looks like two monitors, or two monitors with a little globe. Click the entry in the pop-up menu, which will be similar to the one shown below.
You'll be presented with a dialog similar to the one below, and you'll need to click the View Status link for your local area connection if you're on a wired network.
In the Local Area Connection Status window, click the Details... button and look for the Physical Address entry in the Network Connection Details window.
hope its help......
if u want to know the same for mac.....please tell okk......