Public/ConvertTo-IPv4MaskString.ps1
|
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. .EXAMPLE ConvertTo-IPv4MaskString -MaskBits "24" .EXAMPLE ConvertTo-IPv4MaskString "24" .NOTES Version: 1.0 DateModified: 13/Apr/2022 LasModifiedBy: Vicente Rodriguez Eguibar vicente@eguibar.com Eguibar Information Technology S.L. http://www.eguibarit.com #> [CmdletBinding(ConfirmImpact = 'Low')] Param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, ValueFromRemainingArguments = $false, Position =0)] [ValidateRange(0,32)] [System.Int32] $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 '' } } |