$hash{site} = $ftp_siebel_dns;
$hash{site}{ip_now} = "x";
$hash{site}{ip_new} = "y";

##</code><code>##

%HoH = (
  $ftp_siebel_dns => {
       ip_now => $ftp_siebel_ip,
       ip_new => $ftp_siebel,
       },
  );