java 随机获取国内IP

/*
     * 随机生成国内IP地址
     */
    public static String getRandomIp(){

        //ip范围
        int[][] range = {{607649792,608174079},//36.56.0.0-36.63.255.255
                         {1038614528,1039007743},//61.232.0.0-61.237.255.255
                         {1783627776,1784676351},//106.80.0.0-106.95.255.255
                         {2035023872,2035154943},//121.76.0.0-121.77.255.255
                         {2078801920,2079064063},//123.232.0.0-123.235.255.255
                         {-1950089216,-1948778497},//139.196.0.0-139.215.255.255
                         {-1425539072,-1425014785},//171.8.0.0-171.15.255.255
                         {-1236271104,-1235419137},//182.80.0.0-182.92.255.255
                         {-770113536,-768606209},//210.25.0.0-210.47.255.255
                         {-569376768,-564133889}, //222.16.0.0-222.95.255.255
        };

        Random rdint = new Random();
        int index = rdint.nextInt(10);
        String ip = num2ip(range[index][0]+new Random().nextInt(range[index][1]-range[index][0]));
        return ip;
    }

/*
     * 将十进制转换成ip地址
     */
    public static String num2ip(int ip) {
        int [] b=new int[4] ;
        String x = "";

        b[0] = (int)((ip >> 24) & 0xff);
        b[1] = (int)((ip >> 16) & 0xff);
        b[2] = (int)((ip >> 8) & 0xff);
        b[3] = (int)(ip & 0xff);
        x=Integer.toString(b[0])+"."+Integer.toString(b[1])+"."+Integer.toString(b[2])+"."+Integer.toString(b[3]); 

        return x;
     }

参考：http://www.oschina.net/code/snippet_252582_21129
参考：http://bbs.csdn.net/topics/80096108