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42 lines
1.0 KiB
PowerShell
Executable File
42 lines
1.0 KiB
PowerShell
Executable File
<#
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.SYNOPSIS
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Checks the given subnet mask for validity
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.DESCRIPTION
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This PowerShell script checks the given subnet mask for validity.
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.PARAMETER address
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Specifies the subnet mask to check
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.EXAMPLE
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PS> ./check-subnet-mask.ps1 255.255.255.0
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✅ subnet mask 255.255.255.0 is valid
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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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param([string]$address = "")
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function IsSubNetMaskValid { param([string]$IP)
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$RegEx = "^(254|252|248|240|224|192|128).0.0.0$|^255.(254|252|248|240|224|192|128|0).0.0$|^255.255.(254|252|248|240|224|192|128|0).0$|^255.255.255.(255|254|252|248|240|224|192|128|0)$"
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if ($IP -match $RegEx) {
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return $true
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} else {
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return $false
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}
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}
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try {
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if ($address -eq "" ) { $address = read-host "Enter subnet mask to validate" }
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if (IsSubNetMaskValid $address) {
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"✅ subnet mask $Address is valid"
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exit 0 # success
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} else {
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write-warning "Invalid subnet mask: $address"
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exit 1
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}
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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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