The port number 443 is the default server port for the HTTPS protocol, which is a secure version of HTTP that uses SSL/TLS certificates to encrypt the data transmission between web servers and browsers.The port number 443 is recognized by the Internet Engineering Task Force (IETF) as the standard port for HTTPS connections1.The port number 443 is part of the topic 109.1: Fundamentals of internet protocols, which is one of the objectives of the LPI Linux Administrator - 102 exam23.Reference:1:HTTPS Port: What It Is, How to Use It, and More (2023) - Hostinger2:LPI Linux Administrator - 102 (LPIC-1)3:Exam 102 Objectives