multicasting : Java Glossary

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multicasting
Instead of sending an individual packet over the Internet to each interested party, you send a single packet to a group of listeners. Oddly, RealAudio broadcasting and bulk mail don’t make use of this feature. It is not generally supported on the Internet. But it can be useful to allow a group of users to communicate over a LAN (Local Area Network) or a group of programs to communicate within a machine by broadcasting UDP (User Datagram Protocol) datagrams to each other. Multicasting implies UDP, without acks. IPs 224.x.x.x — 239.x.x.x are reserved for multicasting. To use it to communicate with others on your LAN, your LAN, your router must support multicasting.

Learning More

Oracle’s Javadoc on java.net.DatagramPacket class : available:
Oracle’s Javadoc on java.net.InetAddress class : available:
Oracle’s Javadoc on java.net.MulticastSocket class : available:

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