6918 Unassigned - User Port

6918 is a User Port. Transport Protocol , 6918 Service Name , Service Name Description: Unassigned.

Port	Protocol	Service Name	Description	Source
6918			Unassigned	IANA
6918	TCP UDP		BitTorrent part of full range of ports used most often,Unofficial	wikipedia

Port	Service Name	Description
393	meta5	Meta5
601	syslog-conn	Reliable Syslog Service
687	asipregistry	asipregistry
745		Unassigned
3006	ii-admin	Instant Internet Admin
3221	xnm-clear-text	XML NM over TCP
3353	fatpipe	FATPIPE
3858	trap-port-mom	Trap Port MOM
4766		Unassigned
6865		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