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43 lines
1.5 KiB
PowerShell
Executable File
43 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 measures the latency of public and free DNS servers and lists it.
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.EXAMPLE
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PS> ./list-dns-servers
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Provider IPv4 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 CheckDNSServer { param($Provider, $IPv4Pri, $IPv4Sec)
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Write-Progress "Measuring latency of $Provider..."
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$SW=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Pri 2>$null);[int]$Lat1=$SW.Elapsed.TotalMilliseconds
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$SW=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Sec 2>$null);[int]$Lat2=$SW.Elapsed.TotalMilliseconds
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New-Object PSObject -Property @{ Provider=$Provider; IPv4="$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 "$PSScriptRoot/../Data/public-dns-servers.csv"
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foreach($Row in $Table) {
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CheckDNSServer $Row.PROVIDER $Row.IPv4_PRI $Row.IPv4_SEC
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}
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Write-Progress -completed "."
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}
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try {
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List-DNS-Servers | Format-Table -property @{e='Provider';width=50},@{e='IPv4';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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} |