564 plan 9 file service - System Port

564 is a System Port. Transport Protocol TCP UDP , 564 Service Name 9pfs, Service Name Description: plan 9 file service.

Port	Protocol	Service Name	Description	Source
564	TCP UDP	9pfs	plan 9 file service	IANA
564			Oracle	simovits.com
564	TCP UDP	9pfs	plan 9 file service	bekkoame

Port	Service Name	Description
2555	compaq-wcp	Compaq WCP
4766		Unassigned
6018	x11	X Window System
6157		Unassigned
6667	ircu	IRCU
7147		Unassigned
7829		Unassigned
7912		Unassigned
8063		Unassigned
8595		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