<# .SYNOPSIS Checks the DNS resolution .DESCRIPTION This PowerShell script measures and prints the DNS resolution speed by using 200 frequently used domain names. .EXAMPLE PS> ./check-dns .LINK https://github.com/fleschutz/PowerShell .NOTES Author: Markus Fleschutz | License: CC0 #> try { Write-Progress "⏳ Step 1/2 - Reading from Data/frequent-domains.csv..." $Table = Import-CSV "$PSScriptRoot/../Data/frequent-domains.csv" $NumRows = $Table.Length Write-Progress "⏳ Step 2/2 - Resolving $NumRows domains..." $StopWatch = [system.diagnostics.stopwatch]::startNew() if ($IsLinux) { foreach($Row in $Table){$nop=dig $Row.Domain +short} } else { foreach($Row in $Table){$nop=Resolve-DNSName $Row.Domain} } [float]$Elapsed = $StopWatch.Elapsed.TotalSeconds $Average = [math]::round($NumRows / $Elapsed, 1) if ($Average -gt 10.0) { "✅ DNS resolves $Average domains per second" } else { "⚠️ DNS resolves only $Average domains per second!" } exit 0 # success } catch { "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])" exit 1 }