RARP batch script

This is my batch script with functionality of reversed arp protocol. It is useful for finding IP address of computers with dynamic IP address like Raspberry Pi.

@ECHO OFF
REM "find" command error codes: 
REM  0 – The string you were searching for was found.
REM  1 – The string you were searching for was not found.
REM  2 – This means you had a bad switch or your parameters were incorrect.
 
REM To test: "arp -d [IP]" cancels entry from arp table. Root privilages are required.

setlocal enabledelayedexpansion

set IPclass=%1
set MACaddress=%2

set "result="

IF "%MACaddress%"=="" (
 ECHO Ver. 3.0
 ECHO Usage: rarp [IP class] [MAC address]
 ECHO My popular MAC addresses:
 ECHO Raspberry B = "b8-27-eb-xx-xx-xx"
 GOTO break
) ELSE (
 FOR /l %%i IN (1,1,254) DO (
  CALL :searchMAC
  
  IF ERRORLEVEL 1 GOTO break
  
  ping -n 1 -w 1 %IPclass%.%%i | find "Reply" > NUL
 )
)

REM There will be a for cycle if 'arp -a ^| findstr %MACaddress%' gives a reult of at least one line!!
:searchMAC
SET ERR=0
FOR /f "tokens=*" %%j IN ('arp -a ^| findstr %MACaddress%') DO (
 ECHO Found: %%j
 
 SET ERR=1
)
IF %ERR% == 0 ECHO|set /p="."
EXIT /b %ERR%

:break