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
924		Unassigned
1260	ibm-ssd	ibm-ssd
2011	raid-cc	raid
4109	izm	Instantiated Zero-control Messaging
5652		Unassigned
5884		Unassigned
6332		Unassigned
7503		Unassigned
7673	imqstomps	iMQ STOMP Server over SSL
8915		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