Port 822 Unassigned - System Port

Port 822 is a System Port. Transport Protocol , Port 822 Service Name , Service Name Description: Unassigned.

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

Port	Service Name	Description
897		Unassigned
1037	ams	AMS
1819	plato-lm	Plato License Manager
2628	dict	DICT
2855	msrp	MSRP over TCP
3061	cautcpd	cautcpd
3361	kv-agent	KV Agent
3589	isomair	isomair
3692	intelsync	Brimstone IntelSync
4436		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