RFC 7129

Authenticated Denial of Existence in the DNS, February 2014

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R. Gieben
W. Mekking

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DOI:  http://dx.doi.org/10.17487/RFC7129

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Authenticated denial of existence allows a resolver to validate that a certain domain name does not exist. It is also used to signal that a domain name exists but does not have the specific resource record (RR) type you were asking for. When returning a negative DNS Security Extensions (DNSSEC) response, a name server usually includes up to two NSEC records. With NSEC version 3 (NSEC3), this amount is three. This document provides additional background commentary and some context for the NSEC and NSEC3 mechanisms used by DNSSEC to provide authenticated denial-of-existence responses.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.

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