Symfony\Component\HttpFoundation\RequestMatcher::checkIp PHP Метод

    protected function checkIp($ip)
    {
        if (false !== strpos($this->ip, '/')) {
            list($address, $netmask) = explode('/', $this->ip);

            if ($netmask < 1 || $netmask > 32) {
                return false;
            }
        } else {
            $address = $this->ip;
            $netmask = 1;
        }

        return 0 === substr_compare(sprintf('%032b', ip2long($ip)), sprintf('%032b', ip2long($address)), 0, $netmask);
    }