1503 Databeam - User Port | Service Name:imtc-mcs

1503 is a User Port. Transport Protocol TCP UDP , 1503 Service Name imtc-mcs, Service Name Description: Databeam.

Port	Protocol	Service Name	Description	Source
1503	TCP UDP	imtc-mcs	Databeam	IANA
1503	TCP UDP		Windows Live Messenger (Whiteboard and Application Sharing),Unofficial	wikipedia
1503	TCP UDP		T.120 teleconferencing protocol	bekkoame
1503	TCP UDP	imtc-mcs	Databeam	bekkoame

Port	Service Name	Description
997	maitrd
1175	dossier	Dossier Server
1776	femis	Federal Emergency Management Information System
2231	wimaxasncp	WiMAX ASN Control Plane Protocol
2624	aria	Aria
3918	pktcablemmcops	PacketCableMultimediaCOPS
4810		Unassigned
5444		Unassigned
5543		Unassigned
6329		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