[BCP65]    Best Current Practice 65,
              <https://www.rfc-editor.org/info/bcp65>.
              At the time of writing, this BCP comprises the following:

              Mealling, M., "Dynamic Delegation Discovery System (DDDS)
              Part Five: URI.ARPA Assignment Procedures", BCP 65,
              RFC 3405, DOI 10.17487/RFC3405, October 2002,
              <https://www.rfc-editor.org/info/rfc3405>.

              Hardie, T., "Updated Registration Rules for URI.ARPA",
              BCP 65, RFC 8958, DOI 10.17487/RFC8958, December 2020,
              <https://www.rfc-editor.org/info/rfc8958>.