Public/ConvertTo-IPv4MaskString.ps1
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function ConvertTo-IPv4MaskString { <# .SYNOPSIS Converts a number of bits (0-32) to an IPv4 network mask string (e.g., "255.255.255.0"). .DESCRIPTION Converts a number of bits (0-32) to an IPv4 network mask string (e.g., "255.255.255.0"). .PARAMETER MaskBits Specifies the number of bits in the mask. #> [CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = 'Medium')] Param ( [Parameter(Mandatory = $false, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, ValueFromRemainingArguments = $false, Position = 1)] [ValidateRange(0,32)] [Int] $MaskBits ) Begin { Write-Verbose -Message '|=> ************************************************************************ <=|' Write-Verbose -Message (Get-Date).ToShortDateString() Write-Verbose -Message (' Starting: {0}' -f $MyInvocation.Mycommand) #display PSBoundparameters formatted nicely for Verbose output $NL = "`n" # New Line $HTab = "`t" # Horizontal Tab [string]$pb = ($PSBoundParameters | Format-Table -AutoSize | Out-String).TrimEnd() Write-Verbose -Message "Parameters used by the function... $NL$($pb.split($NL).Foreach({"$($HTab*4)$_"}) | Out-String) $NL" } Process { $mask = ([Math]::Pow(2, $MaskBits) - 1) * [Math]::Pow(2, (32 - $MaskBits)) $bytes = [BitConverter]::GetBytes([UInt32] $mask) (($bytes.Count - 1)..0 | ForEach-Object { [String] $bytes[$_] }) -join "." } End { Write-Verbose -Message "Function $($MyInvocation.InvocationName) finished." Write-Verbose -Message '' Write-Verbose -Message '-------------------------------------------------------------------------------' Write-Verbose -Message '' } } |