680 entrust-aaas - System Port | Service Name:entrust-aaas

680 is a System Port. Transport Protocol TCP UDP , 680 Service Name entrust-aaas, Service Name Description: entrust-aaas.

Port	Protocol	Service Name	Description	Source
680	TCP UDP	entrust-aaas	entrust-aaas	IANA
680	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
680			RTB 666	simovits.com
680	TCP UDP	entrust-aaas	entrust-aaas	bekkoame

Port	Service Name	Description
656	spmp	SPMP
1838	talnet	TALNET
1922	tapestry	Tapestry
2041	interbase
2529	utsftp	UTS FTP
2734	ccs-software	CCS Software
3404		Removed
4032	vrts-auth-port	VERITAS Authorization Service
6870		Unassigned
7608		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