@echo off

if "%~1"=="" (
    echo Usage:
    echo     %~n0 a.b.c.d
    echo     %~n0 a b c d
    echo.
    echo Performs a reverse lookup on IP a.b.c.d.

    goto :EOF
)

if "%~4"=="" (
    for /F "usebackq tokens=1,2,3,4 delims=." %%a in ('%1') do call :doit %%d.%%c.%%b.%%a
) else (
    call :doit %4.%3.%2.%1
)

goto :EOF

:doit
nslookup -type=PTR %1.in-addr.arpa