So my ads keep getting disapproved on Adcenter because of using direct linking to offer. What i need is a PHP code that will check ips of visitors from Ip.txt file and if ip is not listed on txt , script will perform a redirect to offer url. If ip is listed in ip.txt file then it will stay on the same page which is index.php. P.S : My Ip base has IP blocks such as 100.100.0.0 So Php code should understand its an ip block. Any help is appreciated. Thanks.