Tests and compares the speed of popular free/public DNS servers by measuring their response times.

DNSServersBenchmarker.bat

@echo off
setlocal enabledelayedexpansion

REM Configure test parameters
set TEST_DOMAIN=example.com
set TRIES=5

echo Starting DNS Benchmarking... %TEST_DOMAIN%
echo.

for %%d in (
    "Cloudflare,1.1.1.1"
    "Google DNS,8.8.8.8"
    "Google DNS2,8.8.4.4"
    "Quad9,9.9.9.9"
    "OpenDNS,208.67.222.222"
    "CleanBrowsing,185.228.168.9"
    "AdGuard DNS,94.140.14.14"
) do (
    set "dns=%%~d"
    for /f "tokens=1,2 delims=," %%a in ("!dns!") do (
        set "provider=%%a"
        set "ip=%%b"
        echo Testing [%%a] at %%b...

        set total=0
        for /l %%i in (1,1,%TRIES%) do (
            REM Use PowerShell to measure DNS query time
            for /f %%t in ('powershell -command "$sw=[System.Diagnostics.Stopwatch]::StartNew(); Resolve-DnsName -Server %%b -Name %TEST_DOMAIN% -QuickTimeout -ErrorAction SilentlyContinue >null 2>&1; $sw.ElapsedMilliseconds"') do (
                set time=%%t
                echo   Try %%i: !time! ms
                set /a "total+=!time!"
            )
        )
        set /a "average=total/%TRIES%"
        echo.
        echo === Average for %%a: !average! ms ===
        echo.
    )
)

echo Benchmarking complete. Press any key to exit.
pause