<?php //array of ip's you wish to block. Note that you can block an //entire class by replacing it with 0, so to block a class c //(254 computers) use something like 123.123.123.0 $blockIP = array('123.123.123.0','100.100.100.101'); $remote = explode('.',$_SERVER['REMOTE_ADDR']); foreach($blockIP as $ip) { $goodIP = false; for($i=0;$i<4;$i++) { $ipSeg = explode('.',$ip); if($remote[$i] == $ipSeg[$i] || $ipSeg[$i] == '0') { //segment qualifies $goodIP = true; } else { //ip no good so move to the next $goodIP = false; continue 2; } } if($goodIP) { //ip passes so no need to check the rest $blockThisIP = $ip; break; } } //for convenience test $blockThisIP and process here //replace www.crayola.com with the place you wish to //send ip's too if($blockThisIP) { //php header method - can only use this if the page //has not begin to display in the browser header('Location: http://www.crayola.com'); //javascript redirection - use this method if browser has //begun to display page echo "<script type="text/javascript"> window.location = "http://www.crayola.com";</script>"; } ?>