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Editorial Team
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Asked: 2026-05-15T18:33:59+00:00

I’m trying to make a client/server Java App. Both client and server will be

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I’m trying to make a client/server Java App. Both client and server will be running on the same wi-fi network. Server will be running on a specific port that client is aware of.

I am planning to send a multicast message from client through the network for that specific port to discover the server. However, I’m not too sure how I can find out which IP in my network received my message.

Do I need to create a socket on the client and listen to incoming packets once I send my multicast message in case server replies back?

Thanks in advance.

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1 Answer

  1. Editorial Team

    (1)server listens on a pre-arranged port 

    DatagramSocket s = new DatagramSocket(8888);
s.receive  //(1)
s.send     //(2)

    (3)client sends a message to the port, on the broadcast IP, 255.255.255.255

    DatagramSocket c = new DatagramSocket();
c.send(255.255.255.255:8888,msg)     //(3)
c.receive  //(4)

    the client binds to a port too. we didn’t specify it, so it’s random chosen for us.

    (3) will broadcast the message to all local machines, server at (1) receives message, with the client IP:port.

    (2) server sends response message to client IP:port

    (4) client gets the reponse message from server.

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