397 Multi Protocol Trans. Net. - System Port

397 is a System Port. Transport Protocol TCP UDP , 397 Service Name mptn, Service Name Description: Multi Protocol Trans. Net..

Port	Protocol	Service Name	Description	Source
397	TCP UDP	mptn	Multi Protocol Trans. Net.	IANA
397	TCP UDP	mptn	Multi Protocol Trans. Net.	bekkoame

Port	Service Name	Description
271	pt-tls	IETF Network Endpoint Assessment (NEA) Posture Transport Protocol over TLS (PT-TLS)
1063	kyoceranetdev	KyoceraNetDev
1426	sais	Satellite-data Acquisition System 1
1535	ampr-info	ampr-info
3574	dmaf-server	DMAF Server
4468		Unassigned
4739	ipfix	IP Flow Info Export
5424	beyond-remote	Beyond Remote
9475		Unassigned
9844		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