Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration. The registration procedures for service names and port numbers are described in . User Ports are assigned by IANA using the "IETF Review" process, the "IESG Approval" process, or the "Expert Review" process, as per. System Ports are assigned by IETF process for standards‐track protocols, as per . Service names are assigned on a first‐come, first‐served process, as documented in . Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP. Service Name and Transport Protocol Port Number Registry Last Updated 20160314 Expert(s) TCP/UDP: Joe Touch Eliot Lear, Allison Mankin, Markku Kojo, Kumiko Ono, Martin Stiemerling, Lars Eggert, Alexey Melnikov, Wes Eddy, and Alexander Zimmermann SCTP: Allison Mankin and Michael Tuexen DCCP: Eddie Kohler and Yoshifumi Nishida