IP, Mac, Name, Comment
19.0.0.0, 00:00:11:11:11:01, TestUser_1, This is the 1st Testuser
. (here are some used and some free)
.
19.0.2.45 (this one is free)
.
19.0.6.3 (this one is free, too)
19.0.11.201, 11:22:33:44:55:66, TestUser_N, This is just another comment

$x=0
$y=0
$ipstring = "19.0."
for ($i=$x;$i -le 15; $i++)
{
   for ($j=$y;$j -le 255;$j++)
   {
      $gesIP = $ipstring+"$i"+"."+"$j"
   }
}

$usedAddresses = Get-DhcpServerv4Reservation -ComputerName $env:computername -ScopeId ((Get-DhcpServerv4Scope -ComputerName $env:computername).IPAddress.IPAddressToString)

$IP_sort = $IPv4_res  | Sort-Object {"{0:d3}.{1:d3}.{2:d3}.{3:d3}" -f @([int[]]$_.IPAddress.IPAddressToString.split('.'))}

foreach ($ine in $IP_sort)
{
write-output ("{0}  {1}  {2}  {3}" -f ($ine).IPAddress.IPAddressToString, ($ine).ClientId, ($ine).Description, ($ine).Name) | ac EnterPlaceAndTextfileHere
}

if ($ges_IP -eq $IP_sort[$k].IPAddress.IPAddressToString)
{
  write-output ("{0}  {1}  {2}  {3}" -f ($IPv4_res[$k]).IPAddress.IPAddressToString, ($IPv4_res[$k]).ClientId, ($IPv4_res[$k]).Name, ($IPv4_res[$k]).Description) | ac EnterPlaceAndTextfileHere
}
else
{
   $ges_IP | ac EnterPlaceAndTextfileHere
}