Is a fully featured MAC address spoofer for windows! It is an easy to use command line tool that requires almost no prior knowledge about the network cards you wish to spoof the MAC address of. It will generate a random MAC address by default, but you can specify an address to spoof of your own, or reset back to the default using the command line arguments "-m" and "-r" respectively. It needs to be run with admin privileges in order to work because it needs to edit the registry (for spoofing the address) and to take down the network interface temporarily (so that a restart isn't needed for the spoof to take effect).
macchangerWin ;This will assign a random MAC address to the specified NIC
macchangerWin -h ;This displays arg help menu
macchangerWin -r ;This resets the MAC back to the default (stops spoofing)
macchangerWin -o ;Treat ipconfig /all output as it was in previous windows versions
macchangerWin -d "Wireless Network" ;Use ""Wireless Network" as Interface name, without prompt
macchangerWin -m A1B2C3D4E5F6 ;This spoofs the MAC address to A1B2C3D4E5F6.
;A1:B2:C3:D4:E5:F6 a1b2c3d4e5f6 a1:b2:c3:d4:e5:f6 are all acceptable formats as well