Batch file :: if lss is not working properly

My code is pretty much self explanatory :

@echo off
set /a n=0
:doitagain
set /a n+=1
echo Pinging : 10.0.0.%n%
ping 10.0.0.%n%
if %n% lss 255 goto doitagain

pause >nul

but it always pinging 10.0.0.1 so I guess tiny tweak needed here...