[Anonymоus]

Как-то так.

Код:

@Echo Off
SetLocal EnableDelayedExpansion EnableExtensions
Set TotalChars=16
Set GenerateChars=12
Set CharSet=0123456789ABCDEF
:Loop
Set /A Rnd=%TotalChars%*%Random%/32768
Set Mac=!CharSet:~%Rnd%,1!%Mac%
Set /A GenerateChars-=1
If %GenerateChars% GTR 0 GoTo Loop
Reg add "hklm\system\currentcontrolset\control\class\{4D36E972-E325-11CE-BFC1-08002bE10318}\000x" /v "networkaddress" /t reg_sz /d "%Mac%" /f