iJos

 @ECHO OFF
 SETLOCAL ENABLEDELAYEDEXPANSION
 SETLOCAL ENABLEEXTENSIONS

 ::Generate and implement a random MAC address
 FOR /F "tokens=1" %%a IN ('wmic nic where physicaladapter^=true get deviceid ^| findstr [0-9]') DO (
 CALL :MAC
 FOR %%b IN (0 00 000) DO (
 REG QUERY HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\%%b%%a >NUL 2>NUL && REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\%%b%%a /v NetworkAddress /t REG_SZ /d !MAC!  /f >NUL 2>NUL
 )