792 Unassigned - System Port

792 is a System Port. Transport Protocol , 792 Service Name , Service Name Description: Unassigned.

Port	Protocol	Service Name	Description	Source
792			Unassigned	IANA
792	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com

Port	Service Name	Description
1085	webobjects	Web Objects
1099	rmiregistry	RMI Registry
1519	vpvc	Virtual Places Video control
3275	samd	SAMD
4588		Unassigned
4844	gw-log	nCode ICE-flow Library LogServer
5539		Unassigned
6097		Unassigned
6790	hnmp	HNMP
6827		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