Which network port number do web browsers use by default when establishing a secure HTTPS connection to a web server?
22
80
443
53
HTTPS (Hypertext Transfer Protocol Secure) relies on Transport Layer Security to encrypt web traffic. By convention, this service listens on TCP port 443, so browsers automatically attempt to connect to that port when a URL begins with "https://". Port 80 is used for unencrypted HTTP, port 22 is reserved for Secure Shell (SSH) remote logins, and port 53 is assigned to the Domain Name System (DNS). Choosing any of those ports instead of 443 would prevent a standard HTTPS session from being set up because the expected service would not be present, illustrating how specific applications are tied to well-known port numbers.
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