@echo off &setlocal
:newmac
set /a count=0
for /f "tokens=1delims=:" %%i in ('findstr /n "^" "maclist.txt"') do set
/a count=%%i
set /a rd=%random%%%count
if %rd% equ 0 (set "skip=") else set "skip=skip=%rd%"
set "found="
for /f "%skip%tokens=1*delims=:" %%i in ('findstr /n "^" "maclist.txt"')
do if not defined found set "found=%%i"&set "var=%%j"
rem echo.random line %found%: %var%
echo New MAC: %var%
set /a newtime=%random% %%28800+3600
goto main
:main
netsh wlan stop hostednetwork
macshift -i "Wireless Network Connection 4" "%var%"
netsh wlan start hostednetwork
sleep %newtime%
goto newmac
endlocal