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How to change a MAC address in 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 in MacOS

Instructions for changing the MAC address on a Macintosh can be found at MAC Spoofing on the Macintosh.
How to change a MAC address in FreeBSD

In FreeBSD, you can change your MAC address with the `ifconfig <interface> link <address>` command.
How to change a MAC address in Linux

Under Linux, you can change your MAC address with `ifconfig <interface> hw &ltclass> <address>`, or you can use the GNU MAC Changer.
How to change a MAC address in Solaris

In Solaris, you can change the MAC address with the `ifconfig <interface> <ether> <address>` command.
How to change a MAC address in OpenBSD

OpenBSD does not, by default, allow you to change the MAC address. It is possible to change the MAC address under OpenBSD with sea.c.
How to change a MAC address in HP-UX

Under HP-UX, you can change the MAC address in SAM by selecting Networking and Communications, then selecting the interface, then Action, Modify, Advanced Options. HP-UX refers to the MAC address as the "station address".