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6.2. Rejected Queries and Malformed Responses

6.2 Rejected Queries and Malformed Responses​

Some authoritative nameservers respond with REJECTED or NOTIMP when queried for an RR type they do not recognize. At least one authoritative resolver produces a malformed response (with the QR (Query/Response) bit set to "0") when queried for unknown RR types. Per [RFC1034], the correct response RCODE for unknown RR types is 0 ("No error condition").