[BCP232]   Best Current Practice 232,
              <https://www.rfc-editor.org/info/bcp232>.
              At the time of writing, this BCP comprises the following:

              Dickinson, S., Overeinder, B., van Rijswijk-Deij, R., and
              A. Mankin, "Recommendations for DNS Privacy Service
              Operators", BCP 232, RFC 8932, DOI 10.17487/RFC8932,
              October 2020, <https://www.rfc-editor.org/info/rfc8932>.