4878 Reserved - User Port

4878 is a User Port. Transport Protocol TCP , 4878 Service Name , Service Name Description: Reserved.

Port	Protocol	Service Name	Description	Source
4878	TCP		Reserved	IANA
4878	UDP	inst-discovery	Agilent Instrument Discovery	IANA

Port	Service Name	Description
569	ms-rome	microsoft rome
836		Unassigned
1601	aas	aas
1606	slm-api	Salutation Manager (SLM-API)
2386	virtualtape	Virtual Tape
3114	ccmad	CCM AutoDiscover
3237	apparenet-tps	appareNet Test Packet Sequencer
4435		Unassigned
5857		Unassigned
6155		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