4271 VRML Multi User Systems - User Port | Service Name:vrml-multi-use

4271 is a User Port. Transport Protocol , 4271 Service Name vrml-multi-use, Service Name Description: VRML Multi User Systems.

Port	Protocol	Service Name	Description	Source
4271		vrml-multi-use	VRML Multi User Systems	IANA

Port	Service Name	Description
715	iris-lwz	IRIS-LWZ
790		Unassigned
1396	dvl-activemail	DVL Active Mail
1562	pconnectmgr	pconnectmgr
1891	childkey-notif	ChildKey Notification
2035	imsldoc
2612	qpasa-agent	Qpasa Agent
3074	xbox	Xbox game port
7019	doceri-ctl	doceri drawing service control
7901	tnos-sp	TNOS Service Protocol

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