UDP Multicast over the internet?

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In general this is not possible since multicast packets aren’t routed.

There are some techniques to work around this (DVMRP, MOSPF and others) but they all require that you can configure all the routers between your server and the clients (or create a tunnel). There are backbone networks (Abilene, Mbone) with multicast support, but those are of most interest for universities and such. The normal consumer’s internet does not have multicast.

Unfortunately you need point-to-point communication. But you are in good company, internet, radio and TV all do point-to-point, transmitting the same data numerous times. Quite a waste of bandwidth.

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