Jun 01

Indentifying real IP address in PHP

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Did you know that using $_SERVER['REMOTE_ADDR'] to get visitor’s IP address sometimes is not accurate? If your site’s visitor is connected to the Internet via Proxy Server then $_SERVER['REMOTE_ADDR'] in PHP just returns the the IP address of the proxy server and not the IP address of the client’s machine. $_SERVER variable might have a few more useful things available to determine the exact IP address of the client’s machine in PHP, they are HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR.

Here is a really simple function in PHP to find the real IP address of the client’s machine.

  1. <?php
  2. function ThisIP() {
  3.  
  4.     if( array_key_exists(‘HTTP_CLIENT_IP’, $_SERVER) ) {
  5.         return $_SERVER[‘HTTP_CLIENT_IP’];
  6.     }
  7.  
  8.     if( array_key_exists(‘HTTP_X_FORWARDED_FOR’, $_SERVER) ) {
  9.         $ip = $_SERVER[‘HTTP_X_FORWARDED_FOR’];
  10.         if(stristr($ip,",") != "") {
  11.             $ips = explode(",",$ip);
  12.  
  13.             if($ips[count($ips)-1] != ""){
  14.                 $ip = trim($ips[count($ips)-1]);
  15.             } else {
  16.                 $ip = trim($ips[0]);
  17.             }
  18.  
  19.             switch (substr($ip,0,3)) {
  20.                 case "192":
  21.                 case "10.":
  22.                 case "127":
  23.                     if( array_key_exists(‘REMOTE_ADDR’, $_SERVER) ) {
  24.                         return $_SERVER[‘REMOTE_ADDR’];
  25.                     }
  26.                 break;
  27.             }
  28.         }
  29.         return $ip;
  30.     }
  31.  
  32.     if( array_key_exists(‘REMOTE_ADDR’, $_SERVER) ) {
  33.         return $_SERVER[‘REMOTE_ADDR’];
  34.     }
  35.  
  36.     return false;
  37. }
  38. ?>

32 Responses to “Indentifying real IP address in PHP”

  1. mirv7 Says:
    June 1st, 2008 at 2:43 pm

    You need to be careful to think about why you’re needing the IP address. The client’s “real” IP address is a self-reported thing when using this technique. Any client could spoof it. The host IP address may be that of a proxy, but it isn’t spoofed. So they really are different pieces of information, to be used for different purposes. The “real” IP addr of many clients these days is likely to be 192.168.1.101 which is not especially valuable in many cases.

  2. Jeff Says:
    June 6th, 2008 at 2:43 pm

    Great article, thanks!

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