@misc{rfc9444,
    series =    {Request for Comments},
    number =    9444,
    howpublished =  {RFC 9444},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC9444},
    url =       {https://www.rfc-editor.org/info/rfc9444},
    author =    {Owen Friel and Richard Barnes and Tim Hollebeek and Michael Richardson},
    title =     {{Automated Certificate Management Environment (ACME) for Subdomains}},
    pagetotal = 20,
    year =      2023,
    month =     aug,
    abstract =  {This document specifies how Automated Certificate Management Environment (ACME) can be used by a client to obtain a certificate for a subdomain identifier from a certification authority. Additionally, this document specifies how a client can fulfill a challenge against an ancestor domain but may not need to fulfill a challenge against the explicit subdomain if certification authority policy allows issuance of the subdomain certificate without explicit subdomain ownership proof.},
}