for /f "delims=" %%a in (a.txt) do ping %%a>>b.txt
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@echo off
cd.>test.txt
setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do (
rem 下面的ping -n 1速度是最快的，如果想更精确一点改成ping -n 2或ping -n 3 .....
for /f "tokens=3 delims=," %%b in ('ping -n 1 %%a^|find "Average"') do (
set var=%%b
set var=!var:Average=!
set var=!var: =!
set var=!var:ms=!
>>test.txt echo %%a!var!
))
for /f "tokens=2 delims==" %%c in (test.txt) do (
    set /a max=%%c
    for /f "tokens=2 delims==" %%d in (test.txt) do (
        set /a num=%%d
        if !num! gtr !max! (set max=!num!) else set max=!max!
))
type test.txt|findstr /e "=!max!"
del test.txt
pause
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