[STD88]    Internet Standard 88,
              <https://www.rfc-editor.org/info/std88>.
              At the time of writing, this STD comprises the following:

              Thomson, S., Huitema, C., Ksinant, V., and M. Souissi,
              "DNS Extensions to Support IP Version 6", STD 88,
              RFC 3596, DOI 10.17487/RFC3596, October 2003,
              <https://www.rfc-editor.org/info/rfc3596>.