Divert unwanted visitors from your web pages.

IP Blocker Script

How to block IP addresses

This script uses PHP so you need a web host that supports PHP to use this script.

Also, the script will only work when the visitors browser has Javascript enabled which most will.

Edit the list of IP addresses in the ip blocker script to suit your needs.

Replace "ip1","ip2" etc. with full or partial ip addesses (from the leftmost digit onwards) such as: "198.168.01.01", "201","92.101.01" etc.

Save the code as blocker.php to your web site. Then add the calling code to your web pages.

The calling code, calls the ip blocker to check the visitors ip address against your list. If they are not wanted, the blocker script returns a javascript command telling the web browser to divert to another page such as error.html

Step 1 - Install blocker code

First ensure your site supports php scripting.

Then, after editing the list of IP addresses, copy the code below to a file on your website called "blocker.php"

<?php
/*
Copyright (C) 2002  Andrew Wilkes andy@urgentclick.com

IP address blocker. Uses a list of full or partial IP addresses.

This code lets you display an alternative web page if an unwanted visitor
looks at your web page.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

http://www.gnu.org/licenses/gpl.html

Modify the list of banned IP addresses to suit your needs.
Include all or some of the IP address from the leftmost digit.
Replace ip1 etc. with a number such as: 198 or 198.201.01.02
Add as many to the list as you like.
Be careful not to exclude everyone from your site!
*/
$iplist = array("ip1","ip2","ip3"); // the list of banned IPs

$ip = getenv("REMOTE_ADDR"); // get the visitors IP address
// echo "$ip";
$found = false;
foreach ($iplist as $value) { // scan the list
  if (strpos($ip, $value) === 0){
    $found = true;
  }
}

if ($found == true) {
  echo "top.location = \"error.html\";\n"; // page to divert to
}

The old version of the code required complete ip addresses:

<?php
/*
Copyright (C) 2002  Andrew Wilkes andy@urgentclick.com

IP address blocker

This code lets you display an alternative web page if an unwanted visitor
looks at your web page.

http://www.gnu.org/licenses/gpl.html
*/

$ip = getenv("REMOTE_ADDR"); // get the visitors IP address

switch($ip) // check the IP address against the banned list
  {
// Add as many ip addresses to the list as you like in the given format.
  case "ip address to block":
  case "ip address to block":
  case "192.164.0.1": // example
// End of list
    echo "top.location = \"error.html\";\n"; // page to divert to
  break;
  default:
  break;
  }
?>

Step 2 - Add the calling code to your web pages

Add the following code in the head section of your web pages e.g. before the </head> tag.

Step 3 - Create the diversion page

In the script, the unwanted visitors to your site are diverted to the page error.html You could change this to any other page or create your own custom error.html page. Alternatively, just let the error 404 (page not found) message appear. However, this may well reveal your web hosting company to them.

p.s. don't forget to add your site to our members website directory for free traffic and search-engine exposure.

Testimonial

Hi Andy, Your program to block unwanted users is GREAT!! It installed in about 3 minutes, and works like a miracle. THANK YOU!!! One question ...... how can I use wildcards in the addresses? Ie; 123.34.??? ...... this fails to work, and I don't know what to try. I tried an "*" .... didn't work. Can you help me? Thanks a million! Steve

Thanks to Steve's comments, The new code has this feature - Andy

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