503 Intrinsa - System Port | Service Name:intrinsa

503 is a System Port. Transport Protocol TCP UDP , 503 Service Name intrinsa, Service Name Description: Intrinsa.

Port	Protocol	Service Name	Description	Source
503	TCP UDP	intrinsa	Intrinsa	IANA
503	TCP UDP	intrinsa	Intrinsa	bekkoame

Port	Service Name	Description
2225	rcip-itu	Resource Connection Initiation Protocol
2281	lnvconsole	LNVCONSOLE
2876	sps-tunnel	SPS Tunnel
5821		Unassigned
5857		Unassigned
6068	gsmp-ancp	GSMP/ANCP
6272		Unassigned
6366		Unassigned
7042		Unassigned
7470		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