PHP randomly generates domestic IP addresses

<?php
function ip()
{
    $ip_long = array(
        array(&#39;607649792&#39;, &#39;608174079&#39;), // 36.56.0.0-36.63.255.255
        array(&#39;1038614528&#39;, &#39;1039007743&#39;), // 61.232.0.0-61.237.255.255
        array(&#39;1783627776&#39;, &#39;1784676351&#39;), // 106.80.0.0-106.95.255.255
        array(&#39;2035023872&#39;, &#39;2035154943&#39;), // 121.76.0.0-121.77.255.255
        array(&#39;2078801920&#39;, &#39;2079064063&#39;), // 123.232.0.0-123.235.255.255
        array(&#39;-1950089216&#39;, &#39;-1948778497&#39;), // 139.196.0.0-139.215.255.255
        array(&#39;-1425539072&#39;, &#39;-1425014785&#39;), // 171.8.0.0-171.15.255.255
        array(&#39;-1236271104&#39;, &#39;-1235419137&#39;), // 182.80.0.0-182.92.255.255
        array(&#39;-770113536&#39;, &#39;-768606209&#39;), // 210.25.0.0-210.47.255.255
        array(&#39;-569376768&#39;, &#39;-564133889&#39;), // 222.16.0.0-222.95.255.255
        );
    $rand_key = mt_rand(0, 9);
    return $ip = long2ip(mt_rand($ip_long[$rand_key][0], $ip_long[$rand_key][1]));
} 
?>