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RFC 6742 , section
3.2, just recommends that the name servers do some additional
processing, and return other possibly useful ILNP records when
queried. For instance, if NID records are
asked for, there is a good chance L64 records
will be needed soon, so the server could as well find them and
return them in the additional section of the DNS response (in the
two examples above, there is only the answer section).