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37 lines
1003 B
PowerShell
Executable File
37 lines
1003 B
PowerShell
Executable File
<#
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.SYNOPSIS
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Check the DNS resolution
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.DESCRIPTION
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This PowerShell script measures the DNS resolution speed using 100 internet domains and prints it.
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.EXAMPLE
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PS> ./check-dns.ps1
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✅ Internet DNS lookups in 33.6ms
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.LINK
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https://github.com/fleschutz/PowerShell
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.NOTES
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Author: Markus Fleschutz | License: CC0
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#>
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try {
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$table = Import-CSV "$PSScriptRoot/../data/popular-domains.csv"
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$stopWatch = [system.diagnostics.stopwatch]::startNew()
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if ($IsLinux) {
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foreach($row in $table){$nop=dig $row.Domain +short}
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} else {
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Clear-DnsClientCache
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foreach($row in $table){$nop=Resolve-DNSName $row.Domain}
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}
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[float]$elapsed = $stopWatch.Elapsed.TotalSeconds * 1000.0
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$speed = [math]::round($elapsed / $table.Length, 1)
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if ($speed -gt 100.0) {
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Write-Host "⚠️ Internet DNS lookups take $($speed)ms!"
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} else {
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Write-Host "✅ Internet DNS lookups in $($speed)ms"
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}
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exit 0 # success
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} catch {
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"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
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exit 1
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}
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