[amel27]

или так:

Код:

@echo off
SETLOCAL EnableDelayedExpansion
(
set "map=0-0;1-1;2-2;3-3;4-4;5-5;6-6;7-7;8-8;9-9;10-a;11-b;12-c;13-d;14-e;15-f"
set "mac="& for /l %%a in (1,1,12) do (set /a $a=!RANDOM!%%16
call set "$b=%%map:*!$a!-=%%"& set "mac=!mac!!$b:~,1!"))

reg add "HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\000x" /v "NetworkAddress" /t REG_SZ /d "%mac%" /f