530 rpc - System Port | Service Name:courier

530 is a System Port. Transport Protocol TCP UDP , 530 Service Name courier, Service Name Description: rpc.

Port	Protocol	Service Name	Description	Source
530	TCP UDP	courier	rpc	IANA
530	TCP UDP		RPC,Official	wikipedia
530	TCP UDP	courier	rpc	bekkoame

Port	Service Name	Description
1538	3ds-lm	3ds-lm
1994	stun-port	cisco serial tunnel port
2286	nas-metering	NAS-Metering
4167	ddgn	DeskDirect Global Network
4356	qsnet-assist	QSNet Assistant
5677	questdb2-lnchr	Quest Central DB2 Launchr
6561		Unassigned
6850	iccrushmore	ICCRUSHMORE
8389		Unassigned
8629		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