Java无法识别Wi-Fi广播地址

Question

好吧，所以我调整了http://enigma2eureka.blogspot.com/2009/08/finding-your-ip-v4-broadcast-address.html的代码，试图在我的Wi-Fi路由器上找到广播地址的IP地址。

protected static InetAddress getBroadcastAddress() throws SocketException {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface networkInterface = interfaces.nextElement();
            System.out.println(networkInterface.toString() + networkInterface.getInterfaceAddresses());
            if (networkInterface.isLoopback())
                continue; // Don't want to broadcast to the loopback interface
            for (InterfaceAddress interfaceAddress : networkInterface.getInterfaceAddresses()) {
                InetAddress broadcast = interfaceAddress.getBroadcast();
                if (broadcast == null)
                    continue;
                return broadcast;
            }
        }
        return null;
    }

但是，它会打印以下内容 - 接口地址的名称和列表：

name:lo (Software Loopback Interface 1)[/127.0.0.1/8 [/127.255.255.255]]
name:eth0 (Microsoft Kernel Debug Network Adapter)[]
name:net0 (Belkin USB Wireless Adaptor)[null]
...

贝尔金适配器 - net0 - 似乎有一个空的广播地址，虽然它不应该。 （我记得设置了首选的IPv4系统属性）任何人都可以确定它返回null的原因吗？