Код:

@echo off
for /l %%i in (1 1 100) do (
for /l %%j in (5 1 10) do (
call set #%%random%%=%%j
)
)
for /f "delims==" %%i in ('set #') do (
call set raz=%%%%i%%
goto:#
)
:#
for /f "usebackq delims=" %%i in ("example.txt") do (
call set $%%random%%=%%i
)
for /f "delims==" %%i in ('set $') do (
call ping "%%%%i%%" -n %raz%
exit /b
)