How do I change a MAC address?
Every Ethernet card has a MAC address burned-in at the factory. At times, you may want to change this MAC address to one of your own choosing.

The procedures to change a MAC address are specific to each operating system.

How to change a MAC address under Microsoft Windows

Under Windows, the MAC address is stored in a registry key. To change a MAC address, find that key with `regedit` and change it. Of course, Microsoft keeps moving the location of the key around!

Windows XP adds an option to change the MAC address on some network cards under the Advanced tab in the network adapter’s Properties menu. A much easier and more reliable method to change a MAC address under Windows is to use a software utility program designed to do this for you.
Macshift is a free utility that you can use to spoof your MAC address under Microsoft Windows.

How to change a MAC address under MacOS (more…)