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Port 4

Port
Protocol
Service Name
Description
Source
4
TCP UDP
Unassigned
IANA
4
TCP UDP
Unassigned,Official
wikipedia
4
TCP 
Self-Certifying File System(SFS) sfssd acceps connections on TCP port 4 and passes them to the appropriate SFS daemon. SFS is a secure, global file system with completely decentralized control. SFS uses NFS 3 as the underlying protocol for file access.
bekkoame
4
TCP UDP
Unassigned
bekkoame
4
TCP 
Midnight Commander Sometimes this program is assigned to this prot
bekkoame

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

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);