584 Key Server - System Port | Service Name:keyserver

584 is a System Port. Transport Protocol TCP UDP , 584 Service Name keyserver, Service Name Description: Key Server.

Port	Protocol	Service Name	Description	Source
584	TCP UDP	keyserver	Key Server	IANA
584	TCP UDP	keyserver	Key Server	bekkoame

Port	Service Name	Description
2212	leecoposserver	LeeCO POS Server Service
4275	vrml-multi-use	VRML Multi User Systems
4370	elpro-tunnel	ELPRO V2 Protocol Tunnel IANA assigned this well-formed service name as a replacement for "elpro_tunnel".
4402	ds-clnt	ASIGRA Televaulting DS-Client Service
4845	wcr-remlib	WordCruncher Remote Library Service
5995		Unassigned
6505	badm-priv	BoKS Admin Private Port IANA assigned this well-formed service name as a replacement for "badm_priv".
6681		Unassigned
7517		Unassigned
7583		Unassigned

A port is an endpoint of communication in an operating system. While the term is also used for hardware devices, in software it is a logical construct that identifies a specific process or a type of service.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);

The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users. Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port". To the extent possible, these same port assignments are used with the UDP [RFC768]. The range for well-known ports managed by the IANA is 0-1023.
DYNAMIC AND/OR PRIVATE PORTS Registered Ports are those from 1024 through 49151.
The Dynamic and/or Private Ports are those from 49152 through 65535