public function rand_ip(){

          $ip_long = array(

              array('607649792', '608174079'), //36.56.0.0-36.63.255.255

              array('975044608', '977272831'), //58.30.0.0-58.63.255.255

              array('999751680', '999784447'), //59.151.0.0-59.151.127.255

              array('1019346944', '1019478015'), //60.194.0.0-60.195.255.255

              array('1038614528', '1039007743'), //61.232.0.0-61.237.255.255

              array('1783627776', '1784676351'), //106.80.0.0-106.95.255.255

              array('1947009024', '1947074559'), //116.13.0.0-116.13.255.255

              array('1987051520', '1988034559'), //118.112.0.0-118.126.255.255

              array('2035023872', '2035154943'), //121.76.0.0-121.77.255.255

              array('2078801920', '2079064063'), //123.232.0.0-123.235.255.255

              array('-1950089216', '-1948778497'), //139.196.0.0-139.215.255.255

              array('-1425539072', '-1425014785'), //171.8.0.0-171.15.255.255

              array('-1236271104', '-1235419137'), //182.80.0.0-182.92.255.255

              array('-770113536', '-768606209'), //210.25.0.0-210.47.255.255

              array('-569376768', '-564133889'), //222.16.0.0-222.95.255.255

          );

          $rand_key = mt_rand(0, 14);

          $huoduan_ip= long2ip(mt_rand($ip_long[$rand_key][0], $ip_long[$rand_key][1]));

          return $huoduan_ip;

 }