Destination Address Field
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... datagrams can easily be identified by the presence of a class D IP
address in their destination address field; they should be quietly
discarded by hosts that do not support IP multicasting ...
... Host group addresses have been defined specifically for use in the
destination address field of multicast IP datagrams. However, the
...
... uses as more general "logical addresses", both in the source as well
as the destination address field of datagrams. For example, a mobile
IP host ...
... host group
addresses only in the IP destination address field. However, it is
recommended that datagrams with a group ...