Multiple choice technology operating systems What is the Port number used for a SSL? 23 21 80 443 Reveal answer Fill a bubble to check yourself D Correct answer Explanation SSL/TLS for secure HTTP (HTTPS) uses port 443 by default. Port 80 is for standard HTTP, port 21 is for FTP, and port 23 is for Telnet. When you see https:// in a URL, the browser typically connects to port 443.