Automatos.Common

1.0.0

Functions/Networking/Convert-CIDRtoSubnetMask.ps1

function Convert-CIDRtoSubnetMask
{
    [cmdletbinding()]
    Param
    (            
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        [ValidateRange(0,32)]
        [int]
        $CIDR
    )
    Process
    {
        $BinaryMask = ("1"*$cidr+"0"*(32-$cidr))
        $INT64 = [convert]::ToInt64(($BinaryMask),2)
        $IPAddress = Convert-Int64toIP -INT64 $INT64
    }
    End
    {
        $TrueIP = try{[Net.IPAddress]::Parse($IPAddress)}catch{$null}
        if($TrueIP) {$TrueIP.ipaddresstostring}
        else {Write-Host "Could not convert CIDR ($CIDR) and parse resultant IP ($IPAddress)" -ForegroundColor Red}
    }
}