he is using a transparent proxy so you can find out what his real ip is if you want
Code:
<?php
if($HTTP_X_FORWARDED_FOR):
$ip = "$HTTP_X_FORWARDED_FOR";
else:
$ip = "$REMOTE_ADDR";
$fh2 = fopen("ips.txt", 'a+');
fwrite($fh2, "$ip\n");
fclose($fh2);
header("Location: http://redirecttoheresilentlyafterrecordingip.com");
?>
* remember to chmod the file ips.txt