@echo off
setlocal EnableExtensions EnableDelayedExpansion
rem ============================================================
rem Class C ping sweep (parallel, no popup windows)
rem Usage: ping_scan.bat [subnet-prefix] [timeout-ms]
rem Example: ping_scan.bat 192.168.1 300
rem ============================================================
set "subnet=%~1"
set "timeout=%~2"
if not defined timeout set "timeout=30"
if not defined subnet (
set /p "subnet=Enter Class C subnet prefix (e.g., 192.168.1): "
)
if not defined subnet (
echo [ERROR] Subnet cannot be empty.
pause
exit /b 1
)
rem Strip a trailing dot if the user typed one
if "!subnet:~-1!"=="." set "subnet=!subnet:~0,-1!"
set "work=%~dp0scan_tmp"
if exist "!work!" rd /s /q "!work!"
md "!work!"
pushd "!work!"
echo.
echo ===================================================
echo Scanning !subnet!.1 - !subnet!.254 (timeout !timeout! ms)
echo ===================================================
rem Launch all pings in the background of THIS window (start /b = no new window)
for /L %%I in (1,1,254) do (
start "" /b cmd /c "ping -n 1 -w !timeout! !subnet!.%%I | findstr TTL= >nul && echo.>%%I.up & echo.>%%I.done"
)
rem Wait until all 254 jobs have finished
:wait
set "done=0"
for /f %%C in ('dir /b *.done 2^>nul ^| find /c /v ""') do set "done=%%C"
if !done! LSS 254 (
ping -n 2 127.0.0.1 >nul
goto wait
)
echo.
echo Alive hosts:
set "count=0"
for /L %%I in (1,1,254) do (
if exist %%I.up (
echo !subnet!.%%I
set /a count+=1
)
)
popd
echo.
echo ===================================================
echo Scan complete. !count! host(s) alive.
echo ===================================================
pause
rd /s /q "!work!"
endlocal
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