class
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... hosts. Such
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. Class D
addresses are described in section 4 of this memo.
...
... Host groups are identified by class D IP addresses, i.e., those with
"1110" as their high-order four bits ...
... IP addresses, i.e., those with
"1110" as their high-order four bits. Class E IP addresses, i.e.,
those with "1111" as their high-order four bits ...