functions/Convert-FMIpAddressToMaskLength.ps1
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function Convert-FMIpAddressToMaskLength{ <# .SYNOPSIS Converts a IP Subnet-Mask to a Mask Length .DESCRIPTION Converts a IP Address to a Mask Length .PARAMETER dottedIpAddressString The input IP .PARAMETER EnableException Should Exceptions been thrown? .EXAMPLE Convert-FMIpAddressToMaskLength -dottedIpAddressString "255.255.255.0" Returns 24 .EXAMPLE Convert-FMIpAddressToMaskLength -dottedIpAddressString "255.255.255.255" Returns 32 .NOTES General notes #> [OutputType([string])] param( [string] $dottedIpAddressString ) $result = 0; try { # ensure we have a valid IP address [IPAddress] $ip = $dottedIpAddressString; $octets = $ip.IPAddressToString.Split('.'); foreach ($octet in $octets) { while (0 -ne $octet) { $octet = ($octet -shl 1) -band [byte]::MaxValue $result++; } } } catch { Write-PSFMessage -Level Warning "No valid IP Mask" } return $result; } |