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
420	smpte	SMPTE
492	ticf-1	Transport Independent Convergence for FNA
897		Unassigned
998	busboy
2618	priority-e-com	Priority E-Com
3344	bnt-manager	BNT Manager
3576	cmc-port	Coalsere CMC Port
5349	stuns	STUN over TLS
5424	beyond-remote	Beyond Remote
6497		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