3855 OpenTRAC - User Port | Service Name:opentrac

3855 is a User Port. Transport Protocol TCP UDP , 3855 Service Name opentrac, Service Name Description: OpenTRAC.

Port	Protocol	Service Name	Description	Source
3855	TCP UDP	opentrac	OpenTRAC	IANA
3855	TCP UDP	opentrac	OpenTRAC	bekkoame

Port	Service Name	Description
1645	sightline	SightLine
2383	ms-olap4	Microsoft OLAP
2490	qip-qdhcp	qip_qdhcp
4248	vrml-multi-use	VRML Multi User Systems
5018		Unassigned
5032	signacert-agent	SignaCert Enterprise Trust Server Agent
6317	nav-data-cmd	Navtech Radar Sensor Data Command
6548	apc-6548	APC 6548
8629		Unassigned
9932		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