@misc{rfc7129,
    series =    {Request for Comments},
    number =    7129,
    howpublished =  {RFC 7129},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC7129},
    url =       {https://www.rfc-editor.org/info/rfc7129},
    author =    {R. (Miek) Gieben and Matthijs Mekking},
    title =     {{Authenticated Denial of Existence in the DNS}},
    pagetotal = 30,
    year =      2014,
    month =     feb,
    abstract =  {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.},
}