gethostbyaddr

Hi guys, I am new to this list, and signed up specifically for this problem. If any one has any ideas it would be greatly appreciated. I am writing a function to allow users from a specific intranet permission to view a directory. I am getting very different results from IE and Netscape. I have written this in JavaScript as well as PHP, and I am getting the same error in both languages. When I use the gethostbyaddr call, in IE I get a domain name the majority of the time, with a few exceptions. When I use the gethostbyaddr call in Netscape I only receive a domain name if there is a DNS entry. If there is no DNS entry, Netscape returns an IP address. I am not sure what IE is using to get the domain names when there is no DNS entry. How do I get the correct info to be returned from Netscape? Here is the code I am using *********************************** <?php //echo "<pre>"; //print_r($_SERVER); //echo "</pre>"; $hn = gethostbyaddr($_SERVER['REMOTE_ADDR']); echo "host by addr = " . $hn . "\n<br>"; $darr = explode(".", $hn); $cnt = count($darr); $host = $darr[$cnt - 2] . "." . $darr[$cnt - 1]; echo "host = " . $host . "\n<br>"; /* if($host == "xyz.com") header("Location: xyz.html"); else if($host == "abc.com") header("Location: abc.html"); else header("Location: error.html"); */ ?> Thanks in advance for any ideas! Alicia Riggs PSG - Web Development Engineer 214-550-7452