774 - System Port | Service Name:rpasswd

774 is a System Port. Transport Protocol TCP , 774 Service Name rpasswd, Service Name Description: .

Port	Protocol	Service Name	Description	Source
774	TCP	rpasswd		IANA
774	UDP	acmaint-dbd	IANA assigned this well-formed service name as a replacement for "acmaint_dbd".	IANA
774	UDP	acmaint_dbd		IANA
774	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
774	UDP	acmaint_dbd		bekkoame
774	TCP	rpasswd		bekkoame

Port	Service Name	Description
448	ddm-ssl	DDM-Remote DB Access Using Secure Sockets
553	pirp	pirp
1482	miteksys-lm	Miteksys License Manager
2053	lot105-ds-upd	Lot105 DSuper Updates
3138	rtnt-2	rtnt-2 data packets
3487	ltctcp	LISA TCP Transfer Channel
3757	grf-port	GRF Server Port
3990	bv-is	BindView-IS
4040	yo-main	Yo.net main service
4438		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