PowerShell/Scripts/check-ipv6-address.ps1

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<#
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.SYNOPSIS
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Checks an IPv6 address for validity
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.DESCRIPTION
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This script checks the given IPv6 address for validity
.PARAMETER Address
Specifies the IPv6 address to check
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.EXAMPLE
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PS> ./check-ipv6-address fe80::200:5aee:feaa:20a2
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IPv6 fe80::200:5aee:feaa:20a2 is valid
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.LINK
https://github.com/fleschutz/PowerShell
.NOTES
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Author: Markus Fleschutz · License: CC0
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#>
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param([string]$Address = "")
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function IsIPv6AddressValid { param([string]$IP)
$IPv4Regex = '(((25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.){3}(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2}))'
$G = '[a-f\d]{1,4}'
$Tail = @(":",
"(:($G)?|$IPv4Regex)",
":($IPv4Regex|$G(:$G)?|)",
"(:$IPv4Regex|:$G(:$IPv4Regex|(:$G){0,2})|:)",
"((:$G){0,2}(:$IPv4Regex|(:$G){1,2})|:)",
"((:$G){0,3}(:$IPv4Regex|(:$G){1,2})|:)",
"((:$G){0,4}(:$IPv4Regex|(:$G){1,2})|:)")
[string] $IPv6RegexString = $G
$Tail | foreach { $IPv6RegexString = "${G}:($IPv6RegexString|$_)" }
$IPv6RegexString = ":(:$G){0,5}((:$G){1,2}|:$IPv4Regex)|$IPv6RegexString"
$IPv6RegexString = $IPv6RegexString -replace '\(' , '(?:' # make all groups non-capturing
[regex] $IPv6Regex = $IPv6RegexString
if ($IP -imatch "^$IPv6Regex$") {
return $true
} else {
return $false
}
}
try {
if ($Address -eq "" ) {
$Address = read-host "Enter IPv6 address to validate"
}
if (IsIPv6AddressValid $Address) {
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"✔️ IPv6 $Address is valid"
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exit 0 # success
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} else {
write-warning "Invalid IPv6 address: $Address"
exit 1
}
} catch {
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"⚠️ Error: $($Error[0]) ($($MyInvocation.MyCommand.Name):$($_.InvocationInfo.ScriptLineNumber))"
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exit 1
}