835 Unassigned - System Port

835 is a System Port. Transport Protocol , 835 Service Name , Service Name Description: Unassigned.

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

Port	Service Name	Description
414	infoseek	InfoSeek
607	nqs	nqs
1022	exp2	RFC3692-style Experiment 2
3885	topflow-ssl	TopFlow SSL
3917	aftmux	AFT multiplex port
4330	dey-sapi	DEY Storage Administration REST API
5813	icmpd	ICMPD
7346	swx	The Swiss Exchange
7826		Unassigned
9756		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