如何找到为地址的网络部分保留的位数？
以下是我的java代码：

public static void main(String[] args) throws SocketException {
    Enumeration<NetworkInterface> ifaces;
    ifaces = NetworkInterface.getNetworkInterfaces();
    while (ifaces.hasMoreElements()) {
        NetworkInterface iface = ifaces.nextElement();
        System.out.println(iface);

        // loop through all of the (potential) IP addresses configured to use "iface"
        Enumeration<InetAddress> addresses = iface.getInetAddresses();

       // Showing teh value, either ipv4 or ipv6
      // and the number of bits reserved for the network portion of the address

        while (addresses.hasMoreElements()) {

            InetAddress address = addresses.nextElement();
            String hostAddress = address.getHostAddress();

            System.out.println("addr: " + address.);

            if (address instanceof Inet4Address && !address.isLoopbackAddress()) {
                System.out.println("IPv4: /" + hostAddress);
            }
            else if(address instanceof Inet6Address && !address.isLoopbackAddress()){
                System.out.println("IPv6: /" + hostAddress);
            }

        }

    }
}

我应该得到的输出示例：

name:lo0 (lo0)
    IPv6: /fe80:0:0:0:0:0:0:1%lo0, 64 bits reserved for the network
    IPv6: /0:0:0:0:0:0:0:1%lo0, 128 bits reserved for the network
    IPv4: /127.94.0.1, 8 bits reserved for the network
    IPv4: /127.0.0.1, 8 bits reserved for the network

如何获得每个mac地址的保留位数？