Ban IP

Platform:  PHP
Published  Jul 26, 2007
Updated  Jul 26, 2007
This is a short tutorial on how to ban an IP address from your website.

Either create a new .php document in a text editor or add the following php to an existing .php document. (ex. index.php)
Now to explain the code.

1. <?php - Starts the php tag. Lets the browser know what language you are using.
2. $ip = getenv('REMOTE_ADDR'); - Gets the users IP address
3. $blocked = "xx.xx.xx.xx"; - Tells the browser that the "xx.xx.xx.xx" IP is blocked/banned
4. if (ereg($blocked,$ip)) - If the blocked/banned IP is the same as the users IP, the following echo will be displayed.
5. { - Starts a bracket
6. echo "You Have Been Banned"; - Echos the "You Have Been Banned" line onto the page.
7. exit(); - Exit so no more content is ouput
8. } - Ends a bracket
9. ?> - Ends the php tag

$ip = getenv('REMOTE_ADDR');
$blocked = "xx.xx.xx.xx"; // Replace the x's with the IP address.

if (ereg($blocked,$ip))
echo "You Have Been Banned";

'echo "You Have Been Banned";'


Sign in to comment.
Joshuaxiong1   -  Mar 08, 2009
nice script
alanhogan   -  Jan 08, 2008
To be more constructive -- first off thanks for commenting your code and explaining it to n00bs. Secondly, if you want to use regular expressions, the preg_ functions are supposed to be faster/better. Thirdly, try \'/^34\\.12\\.233\\.254/$\' to match one address or \'/^34\\.12\\.233\\.(1|2)?[0-9]{1,2}/$\' to match a range. ^ means \"Beginning of string\" and $ means \"end\" when they are used in the first and last positions ([^6] means any character except 6)
alanhogan   -  Jan 08, 2008
This script is incorrect... Won\'t it ban you if your IP is \"\" and it\'s trying to ban \"\"? Why not use == instead of ereg? It\'ll be faster anyway. This isn\'t Java; == doesn\'t compare identity in PHP but rather value!
peterpowell   -  Aug 16, 2007
i made a script like this - it checked the ip against the ip adresses in ban.txt

try that ;)
Snipe   -  Aug 10, 2007
You should make an array so you can block multiple IP\'s
F*U*R*B*Y*   -  Jul 27, 2007
and also missing the else { (Dunno if it is necessary but i find it easier to code with) and why not use die(\"You are banned\");
[M]ike   -  Jul 26, 2007
And if you do mean \"You haven\'t been banned\" - is that really neccisary? Surely not that many people are going to be banned, therefore it\'s easier to say nothing if they aren\'t. :)
Hawkee   -  Jul 26, 2007
Don\'t you mean \"You haven\'t been banned\" after the if-statement and exit?
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