7863 Unassigned - User Port

7863 is a User Port. Transport Protocol , 7863 Service Name , Service Name Description: Unassigned.

Port	Protocol	Service Name	Description	Source
7863			Unassigned	IANA
7863	UDP		QuickTime Streaming Server	Apple.com

Port	Service Name	Description
1393	iclpv-nls	Network Log Server
1567	jlicelmd	jlicelmd
1779	pharmasoft	pharmasoft
1927	videte-cipc	Videte CIPC Port
2198	onehome-remote	OneHome Remote Access
3526	starquiz-port	starQuiz Port
5206		Unassigned
5320	bsfserver-zn	Webservices-based Zn interface of BSF
5351		Reserved
5418	mcntp	MCNTP

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