652 HELLO_PORT - System Port | Service Name:hello-port

652 is a System Port. Transport Protocol TCP UDP , 652 Service Name hello-port, Service Name Description: HELLO_PORT.

Port	Protocol	Service Name	Description	Source
652	TCP UDP	hello-port	HELLO_PORT	IANA
652	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
652	TCP UDP	hello-port	HELLO_PORT	bekkoame

Port	Service Name	Description
4784	bfd-multi-ctl	BFD Multihop Control
5073	tag-pm	Advantage Group Port Mgr
5512		Unassigned
5758		Unassigned
6138		Unassigned
6316	abb-escp	Ethernet Sensor Communications Protocol
6870		Unassigned
9034		Unassigned
11629		Unassigned
12075		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