User Ports are assigned by IANA using the "IETF Review" process, the "IESG . 49 tcp Login Host Protocol (TACACS) [Pieter_Ditmars] [Pieter_Ditmars] tacacs 49 over [Christopher_Allen] [Christopher_Allen] TLS/SSL nas 991 tcp Netnews 2011-09-26 5842 udp Reserved 5843-5858 Unassigned wherehoo 5859 tcp .