A PHP function to determine if a given IP address lies within a given range.

gistfile1.aw

<?php

function check_ip_range($target, $range_start, $range_end)
{
	if (ip2long($target) >= ip2long($range_start) && ip2long($target) <= ip2long($range_end))
		return true;
	else
		return false;
}

// Should return false
var_dump(check_ip_range("127.0.0.1","10.0.0.0","10.255.255.255"));
// Should return true
var_dump(check_ip_range("10.6.0.134","10.0.0.0","10.255.255.255"));

?>