Still, due to human error and the multi-vendor nature of most deployments, MAC address conflicts still occur. The 48-bit length of the MAC address provides trillions of unique addresses. Yes, there are legitimate reasons to 'spoof' an interface's MAC address.

Choose the one from the menu you’d like to change, add the MAC address you’d like to associate with it, and away you go. MacMakeup presents a list of installed interfaces. The hardware MAC address of the interface remains embedded on the network controller, however the MAC address shown to the network comes from the registry entry. On some older UNIX-like OS’s, this software-created MAC was called an LAA (Locally Administered Address). It spoofs the chosen interface’s MAC address by adding an entry in the Windows registry. MacMakeup is a simple and lightweight application. MAC addresses can be crafted to resemble different types of interfaces and systems. You can also create a new MAC using various online tools.

The practice of changing MAC addresses is sometimes referred to as 'MAC address spoofing.” MacMakeup allows you to set the interface address to one of your choosing.

MacMakeup is one of those handy tools to keep around just in case. It also features the ability to tune ordinarily-hidden parameters for system tuning and security validation. MacMakeup is a free application for Windows 2000/WinXP/Vista/Win7 that allows the real-time change of the MAC address of any interface on the system.

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