Expand-IPRange

Expand-IPRange.ps1

<#
.Synopsis
   A PowerShell function to expand IP Ranges with dashes
.DESCRIPTION
   This function will take an array of IP address ranges and 
   split them out into single IP addresses
.EXAMPLE
   Expand-IPRange -Range '192.0.0.1-192.0.0.100','192.0.0.150-192.0.10.1'
.EXAMPLE
   Expand-IPRange -Range '192.0.0.1-192.0.0.100','192.0.0.140','172.0.0.1-172.0.1.240'
#>
function Expand-IPRange
{
    [CmdletBinding()]
    [Alias()]
    [OutputType([int])]
    Param
    (
        # Param1 help description
        [Parameter(Mandatory=$true,
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
        $Range
    )

    Begin
    {
       $ReturnObject = @()
    }
    Process
    {
        foreach ($ipaddress in $($Range))
        {
            if ($ipaddress -match "-")
            {
                $splitip = $ipaddress -split '[\-]'
                for ($ip=0;$ip -lt $splitip.count;$ip++)
                {
                    if ($ip -eq "0")
                    {
                        $startSplitIp = $splitip[$ip]
                    }
                    else
                    {
                        $endSplitIp = $splitip[$ip]
                                   
                        $ip1 = ([System.Net.IPAddress]$startSplitIp).GetAddressBytes()
                        [Array]::Reverse($ip1)
                        $ip1 = ([System.Net.IPAddress]($ip1 -join '.')).Address

                        $ip2 = ([System.Net.IPAddress]$endSplitIp).GetAddressBytes()
                        [Array]::Reverse($ip2)
                        $ip2 = ([System.Net.IPAddress]($ip2 -join '.')).Address

                        for ($x=$ip1; $x -le $ip2; $x++)
                        {
                            $ips = ([System.Net.IPAddress]$x).GetAddressBytes()
                            [Array]::Reverse($ips)
                            $ReturnObject += $ips -join '.'
                        }
                    }
                }
            }          
            else
            {  
                $ReturnObject += $ipaddress     
            }
        }
    }
    End
    {
        return $ReturnObject
    }
}