2891 CINEGRFX-ELMD License Manager - User Port

2891 is a User Port. Transport Protocol TCP UDP , 2891 Service Name cinegrfx-elmd, Service Name Description: CINEGRFX-ELMD License Manager.

Port	Protocol	Service Name	Description	Source
2891	TCP UDP	cinegrfx-elmd	CINEGRFX-ELMD License Manager	IANA
2891	TCP UDP	cinegrfx-elmd	CINEGRFX-ELMD License Manager	bekkoame

Port	Service Name	Description
988		Unassigned
1493	netmap-lm	netmap_lm IANA assigned this well-formed service name as a replacement for "netmap_lm".
2298	d2k-datamover2	D2K DataMover 2
2555	compaq-wcp	Compaq WCP
2823	cqg-netlan	CQG Net/LAN
2941	sm-pas-4	SM-PAS-4
4694		Unassigned
5567	enc-eps-mc-sec	EMIT protocol stack multicast/secure transport
5676	raadmin	RA Administration
6784		Reserved

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