mirror of
https://github.com/fleschutz/PowerShell.git
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58 lines
2.7 KiB
PowerShell
Executable File
58 lines
2.7 KiB
PowerShell
Executable File
<#
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.SYNOPSIS
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Check DNS servers
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.DESCRIPTION
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This PowerShell script measures the availability and latency of public DNS servers and lists it.
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.EXAMPLE
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PS> ./check-dns-server
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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 CheckDNS { param($Name, $IPv4Pri, $IPv4Sec)
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$StopWatch = [system.diagnostics.stopwatch]::startNew()
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$null = (nslookup fleschutz.de $IPv4Pri 2>$null)
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[int]$Elapsed1 = $StopWatch.Elapsed.TotalMilliseconds
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$StopWatch = [system.diagnostics.stopwatch]::startNew()
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$null = (nslookup fleschutz.de $IPv4Sec 2>$null)
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[int]$Elapsed2 = $StopWatch.Elapsed.TotalMilliseconds
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New-Object PSObject -Property @{ DNS_server=$Name; IPv4="$IPv4Pri / $IPv4Sec"; Latency="$Elapsed1 / $Elapsed2 ms" }
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}
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function ListDNSServerSpeed {
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Write-Progress "Measuring latency of public DNS servers..."
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CheckDNS "Cloudflare (standard)" 1.1.1.1 1.0.0.1
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CheckDNS "Cloudflare (with malware blocklist)" 1.1.1.2 1.0.0.2
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CheckDNS "Cloudflare (with malware+adult blocklist)" 1.1.1.3 1.0.0.3
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CheckDNS "DNS0.eu (standard)" 193.110.81.0 185.253.5.0
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CheckDNS "DNS0.eu (for kids)" 193.110.81.1 185.253.5.1
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CheckDNS "DNS0.eu (zero)" 193.110.81.9 185.253.5.9
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CheckDNS "Google Public DNS" 8.8.8.8 8.8.4.4
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CheckDNS "Level3 one" 4.2.2.1 4.2.2.1
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CheckDNS "Level3 two" 4.2.2.2 4.2.2.2
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CheckDNS "Level3 three" 4.2.2.3 4.2.2.3
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CheckDNS "Level3 four" 4.2.2.4 4.2.2.4
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CheckDNS "Level3 five" 4.2.2.5 4.2.2.5
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CheckDNS "Level3 six" 4.2.2.6 4.2.2.6
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CheckDNS "OpenDNS Basic" 208.67.222.222 208.67.220.220
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CheckDNS "OpenDNS Family Shield" 208.67.222.123 208.67.220.123
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CheckDNS "OpenNIC" 94.247.43.254 94.247.43.254
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CheckDNS "Quad9 (with malware blocklist, with DNSSEC)" 9.9.9.9 9.9.9.9
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CheckDNS "Quad9 (no malware blocklist, no DNSSEC)" 9.9.9.10 9.9.9.10
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CheckDNS "Quad9 (with malware blocklist, with DNSSEC, with EDNS)" 9.9.9.11 9.9.9.11
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CheckDNS "Quad9 (with malware blocklist, with DNSSEC, NXDOMAIN only)" 9.9.9.12 9.9.9.12
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CheckDNS "Verisign Public DNS" 64.6.64.6 64.6.65.6
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Write-Progress -completed " "
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}
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try {
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ListDNSServerSpeed | Format-Table -property @{e='DNS_server';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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} |