Redirecting IP if it's between a certain IP Range

I'm using a redirect if the user's ip is between a certain IP range. However, I'm using multiple ip ranges, so I'm wondering the best way to do this. I'm current using th开发者_开发百科is to redirect,

But if the IP ranges are say from 72.122.166.0-72.122.159.266 and 68.61.156.0-68.61.181.255 and 78.121.74.0-78.121.77.255 then how would I do that? Thanks!

The best way to check IP ranges is to convert the dotted address into a 32-bit number and perform comparisons on that. The ip2long function can do the conversion for you. For example:

$range_start = ip2long("68.61.156.0");
$range_end   = ip2long("68.61.181.255");
$ip          = ip2long($_SERVER['REMOTE_ADDR']);
if ($ip >= $range_start && $ip <= $range_end) {
  // blocked
}

You can put several of these ranges into an array and iterate over it to check multiple ranges.

<?php
/* VARIABLES */
// -------------------------------
$ip = ip2long($_SERVER['REMOTE_ADDR']);
$current_ip_range = array(); // Class "X" range.

$range = (object) array();
//$range->name = '24-Bit Block';
$range->lower = ip2long('0.0.0.0'); //This is the initial value.
$range->upper = ip2long('83.50.207.254'); //This is the final value.
$current_ip_range[] = $range;
// -------------------------------

if ($ip >= $range->lower && $ip <= $range->upper) 
{
        /* ----------------------------------------
         * We ask to the server if the IP grabbed
         * is <= or => to the ip ranges and if if does
         * so, shows success message.
         * -------------------------------------- */
        echo "La IP $ip está dentro del rango";

}

else
{
        /* ----------------------------------------
         * If it isn't, shows a failure message.
         * -------------------------------------- */
        echo "La ip $ip no está dentro del rango";

}

If you're willing to use SQL, and have a table of IP ranges,

SELECT * FROM `ips` WHERE $ip BETWEEN `start` AND `end`

If you get zero results, then it's not blocked.

EDIT: Using the ip2long function, of course.

This is a better way if you have a lot of random ranges; a pure PHP way is better for fewer.