478 spsc - System Port | Service Name:spsc

478 is a System Port. Transport Protocol TCP UDP , 478 Service Name spsc, Service Name Description: spsc.

Port	Protocol	Service Name	Description	Source
478	TCP UDP	spsc	spsc	IANA
478	TCP UDP	spsc	spsc	bekkoame

Port	Service Name	Description
956		Unassigned
1253	q55-pcc	q55-pcc
2006	invokator
2797	esp-encap	esp-encap
2916	elvin-server	Elvin Server IANA assigned this well-formed service name as a replacement for "elvin_server".
3264	ccmail	cc:mail/lotus
3430	ssdispatch	Scott Studios Dispatch
5350		Reserved
7219		Unassigned
7555		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