Windows XP
Click on the Start Menu, then select the Run item.
Type cmd in the text field.
A terminal window will appear on the screen. Type ipconfig /all and return.
There will be a block of information for each adapter on your computer. Look in the description field for wireless. The Physical Address for that block is your wireless MAC address.
Mac OSX
Click on the Apple Menu, and choose the Location menu item.
Click on Network Preferences.
Click on the Show menu and choose the AirPort item.
The AirPort ID is your wireless MAC address.
Linux
In a terminal window type ifconfig and return.
You'll see a list of interfaces. Your wireless interface will likely be named wlan0 or wifi0. The wireless MAC address will be in the field labeled HWaddr.
You can also use iwconfig to find your wireless MAC address if you have it installed.
