Private/GetIPRange.ps1

<#
  .SYNOPSIS
    Get the IP addresses in a range

    From: https://gallery.technet.microsoft.com/scriptcenter/List-the-IP-addresses-in-a-60c5bb6b

  .EXAMPLE
    Get-IPRange -start 192.168.8.2 -end 192.168.8.20

  .EXAMPLE
    Get-IPRange -ip 192.168.8.2 -mask 255.255.255.0

  .EXAMPLE
    Get-IPRange -ip 192.168.8.3 -cidr 24
#>

function GetIPRange {
    [CmdletBinding()] 
    param ( 
      [string]$start, 
      [string]$end, 
      [string]$ip, 
      [string]$mask, 
      [int]$cidr 
    ) 
    
    function IP-toINT64 () { 
      param ($ip) 
    
      $octets = $ip.split(".") 
      return [int64]([int64]$octets[0]*16777216 +[int64]$octets[1]*65536 +[int64]$octets[2]*256 +[int64]$octets[3]) 
    } 
    
    function INT64-toIP() { 
      param ([int64]$int) 
  
      return (([math]::truncate($int/16777216)).tostring()+"."+([math]::truncate(($int%16777216)/65536)).tostring()+"."+([math]::truncate(($int%65536)/256)).tostring()+"."+([math]::truncate($int%256)).tostring() )
    } 
    
    if ($ip) {$ipaddr = [Net.IPAddress]::Parse($ip)} 
    if ($cidr) {$maskaddr = [Net.IPAddress]::Parse((INT64-toIP -int ([convert]::ToInt64(("1"*$cidr+"0"*(32-$cidr)),2)))) } 
    if ($mask) {$maskaddr = [Net.IPAddress]::Parse($mask)} 
    if ($ip) {$networkaddr = new-object net.ipaddress ($maskaddr.address -band $ipaddr.address)} 
    if ($ip) {$broadcastaddr = new-object net.ipaddress (([system.net.ipaddress]::parse("255.255.255.255").address -bxor $maskaddr.address -bor $networkaddr.address))} 
    
    if ($ip) { 
      $startaddr = IP-toINT64 -ip $networkaddr.ipaddresstostring 
      $endaddr = IP-toINT64 -ip $broadcastaddr.ipaddresstostring 
    } else { 
      $startaddr = IP-toINT64 -ip $start 
      $endaddr = IP-toINT64 -ip $end 
    }
    
    for ($i = $startaddr; $i -le $endaddr; $i++) {
      INT64-toIP -int $i
    }
}

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