Port
Port 443 — HTTPS
Port 443 (TCP) is used by HTTPS. HTTP over TLS — encrypted web traffic. The backbone of the secure web.
Port 443 at a glance
| Property | Value |
|---|---|
| Port number | 443 |
| Transport | TCP |
| Service | HTTPS |
| Category | Well-known port |
What it is used for
HTTP over TLS — encrypted web traffic. The backbone of the secure web.
Security considerations
Secure when using modern TLS (1.2/1.3) and valid certificates.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 443 used for?
Port 443 (TCP) is used by HTTPS. HTTP over TLS — encrypted web traffic. The backbone of the secure web.
Is port 443 TCP or UDP?
Port 443 uses TCP.
Is it safe to open port 443?
Secure when using modern TLS (1.2/1.3) and valid certificates.
Related
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