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42 lines
1.5 KiB
PowerShell
Executable File
42 lines
1.5 KiB
PowerShell
Executable File
<#
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.SYNOPSIS
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Lists DNS servers
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.DESCRIPTION
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This PowerShell script list public and free DNS servers together with IPv4 addresses and measured latency.
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.EXAMPLE
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PS> ./list-dns-servers.ps1
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DNS PROVIDER IPv4 ADDRESSES LATENCY
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------------ ---- --------- -------
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AdGuard DNS (Cyprus) 94.140.14.14 · 94.140.15.15 222 · 205 ms
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...
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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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function MeasureDNSServer([string]$provider, [string]$IPv4Pri, [string]$IPv4Sec) {
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$time=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Pri 2>$null);[int]$lat1=$time.Elapsed.TotalMilliseconds
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$time=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Sec 2>$null);[int]$lat2=$time.Elapsed.TotalMilliseconds
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New-Object PSObject -Property @{ 'DNS PROVIDER'=$provider; 'IPv4 ADDRESSES'="$IPv4Pri · $IPv4Sec"; LATENCY="$lat1 · $lat2 ms" }
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}
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function List-DNS-Servers {
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Write-Progress "Loading data/public-dns-servers.csv..."
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$table = Import-CSV "$PSScriptRoot/../data/public-dns-servers.csv"
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Write-Progress -completed "Done."
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foreach($row in $table) { MeasureDNSServer $row.PROVIDER $row.IPv4_PRI $row.IPv4_SEC }
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}
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try {
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List-DNS-Servers | Format-Table -property @{e='DNS PROVIDER';width=50},@{e='IPv4 ADDRESSES';width=32},@{e='LATENCY';width=15}
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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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