Usually all ports less than 1024 are not recommended to use as they can be busy with other popular network services.

 

TCP port

Description

20

FTP port for file transfer services;

21

data port for FTP file transfer;

80

default port for WEB-servers. Apache, IIS, NodeJS, and Skype ( HTTP) are using this port;

443

port for WEB servers (secured connections: protocol HTTPS);

10896

Skype.