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An IP multicast address names a destination group, not a single receiving interface. Devices that have joined the group are intended to receive traffic sent to that address; unlike unicast, multicast can deliver one transmission to multiple interested receivers.
What does an IP multicast address identify?
It identifies a group of receivers. RFC 1112 describes an IPv4 multicast group as a “host group”: a set of zero or more hosts identified by one IP destination address. A sender transmits an IP datagram to that group address, and hosts that have requested reception are the intended recipients.
Membership is not fixed: hosts can join or leave a group. Multicast delivery is best effort, so it does not guarantee that every member receives every datagram or that datagrams arrive in the same order.
How is multicast different from unicast?
- Unicast: the destination address identifies one receiving interface.
- Multicast: the destination address identifies a group whose interested members may receive the transmission.
What do membership and scope mean?
Membership describes whether a host has requested to receive traffic for a multicast group. Because hosts can join and leave, the intended receiver set can change over time.
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Scope describes the intended reach of multicast traffic. The address alone names the group; it does not mean that every device on the internet will receive the traffic. Actual delivery depends on the group members and the network path carrying the datagrams.
How can you recognize IPv4 and IPv6 multicast addresses?
The provided standards material establishes the group-address concept and IPv4 host-group terminology, but it does not specify address ranges or recognition rules for IPv4 or IPv6. Therefore, a numeric prefix or range cannot be stated here reliably.
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