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Now live: A fully responsive profile. Linked 0. I include one summary topic on multicasting for your perusal, and also want to briefly discuss here IP addressing issues related to multicasting. So, the full range of multicast addresses is from Since multicast addresses represent a group of IP devices sometimes called a host group they can only be used as the destination of a datagram; never the source.
The size of the Class D multicast address space is therefore 2 28 or ,, multicast groups. There is no substructure that defines the use of these 28 bits; there is no specific concept of a network ID and host ID as in classes A, B and C. However, certain portions of the address space are set aside for specific uses. Table 48 and Figure 63 show the general allocation of the Class D address space.
Note: As with the other IP address classes, the entire 32 bits of the address is always used; we are just only interested in the least-significant 28 bits because the upper four bits never change.
They are analogous to the Class A, B and C unicast addresses and can be assigned to various groups.
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