664 DMTF out-of-band secure web services management protocol - System Port

664 is a System Port. Transport Protocol TCP , 664 Service Name oob-ws-https, Service Name Description: DMTF out-of-band secure web services management protocol.

Port	Protocol	Service Name	Description	Source
664	TCP	oob-ws-https	DMTF out-of-band secure web services management protocol	IANA
664	UDP	asf-secure-rmcp	ASF Secure Remote Management and Control Protocol	IANA
664	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
664	TCP UDP	asf-secure-rmcp	ASF Secure Remote Management and Control Protocol	bekkoame

Port	Service Name	Description
353	ndsauth	NDSAUTH
587	submission	Message Submission
1814	tdp-suite	TDP Suite
2225	rcip-itu	Resource Connection Initiation Protocol
2256	pcc-mfp	PCC MFP
2570	hs-port	HS Port
2823	cqg-netlan	CQG Net/LAN
4002	pxc-spvr-ft	pxc-spvr-ft
4886		Unassigned
5070	vtsas	VersaTrans Server Agent Service

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