Each ethernet device is assigned a unique hardware address by the manufacturer. Manufacturers are each assigned a range of addresses that they may use in their manufacturing, so that it is not possible for two vendors to assign the same address. These hardware addresses are called MAC Addresses.
You can search by MAC number to find out what vendor's hardware you are looking for. An interactive database is available from the IEEE for this purpose. You can also check Cavebear's list of Vendor Codes
To find your MAC address in Windows, do the following:
- Click on Start > Run
- Type "cmd" in the Run box and hit OK.
- At the command prompt type "ipconfig /all"
- You should see a screen similar to the one below
The first highlighted Physical Address shows your Ethernet MAC address. The second shows your Wireless MAC address.
To locate your Ethernet and Wireless MAC addresses using a Mac OSX, do the following:
- Click Apple > System Preferences > Network
- With the AirPort device selected, click the Advanced button in the bottom right of the Network box.
- Your Wireless MAC address is under the Airport tab as Airport ID. It should be a mix of letters, numbers, and colons, something like the following: Airport ID: 00:1d:4f:1b:5c:fa)
- Your Ethernet MAC address is located under the Ethernet Device Advanced section. Cancel out of the Advanced section of your Airport device, and select the Ethernet device along the left-hand side of the Network box. Click the Advanced tab in the bottom right. In the Advanced section, click on the Ethernet tab at the top. Your Ethernet ID (e.g - 00:13:6b:a8:a2:d5) will be listed there.