Cotton, M., Eggert, L., Touch, J., Westerlund, M., and S. Cheshire, "Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry", BCP 165, RFC 6335, August 2011. 

Touch, J., "Recommendations on Using Assigned Transport Port Numbers", BCP 165, RFC 7605, August 2015.

<https://www.rfc-editor.org/info/bcp165>