@misc{rfc8020,
    series =    {Request for Comments},
    number =    8020,
    howpublished =  {RFC 8020},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC8020},
    url =       {https://www.rfc-editor.org/info/rfc8020},
    author =    {Stéphane Bortzmeyer and Shumon Huque},
    title =     {{NXDOMAIN: There Really Is Nothing Underneath}},
    pagetotal = 10,
    year =      2016,
    month =     nov,
    abstract =  {This document states clearly that when a DNS resolver receives a response with a response code of NXDOMAIN, it means that the domain name which is thus denied AND ALL THE NAMES UNDER IT do not exist. This document clarifies RFC 1034 and modifies a portion of RFC 2308: it updates both of them.},
}