668 MeComm - System Port | Service Name:mecomm

668 is a System Port. Transport Protocol TCP UDP , 668 Service Name mecomm, Service Name Description: MeComm.

Port	Protocol	Service Name	Description	Source
668	TCP UDP	mecomm	MeComm	IANA
668	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
668			Unicorn	simovits.com
668	TCP UDP	mecomm	MeComm	bekkoame

Port	Service Name	Description
110	pop3	Post Office Protocol - Version 3
175	vmnet	VMNET
669	meregister	MeRegister
734		Unassigned
839		Unassigned
1177	dkmessenger	DKMessenger Protocol
1365	adapt-sna	Network Software Associates
1883	ibm-mqisdp	IBM MQSeries SCADA
2018	terminaldb
2629	sitaraserver	Sitara Server

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