3971 LANrev Server - User Port | Service Name:lanrevserver

3971 is a User Port. Transport Protocol TCP UDP , 3971 Service Name lanrevserver, Service Name Description: LANrev Server.

Port	Protocol	Service Name	Description	Source
3971	TCP UDP	lanrevserver	LANrev Server	IANA
3971	TCP UDP	cobraserver	Cobra Server	bekkoame

Port	Service Name	Description
272		Unassigned
709	entrust-kmsh	Entrust Key Management Service Handler
984		Unassigned
1690	ng-umds	ng-umds
1808	oracle-vp2	Oracle-VP2
2078	tpcsrvr	IBM Total Productivity Center Server
2311	messageservice	Message Service
3390	dsc	Distributed Service Coordinator
3799	radius-dynauth	RADIUS Dynamic Authorization
4604		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