Port 443 — HTTPS
Quick reference for TCP/UDP port 443, used by HTTPS. Includes what the service does, security guidance and related ports.
What is port 443?
HTTP over TLS — the modern default for the web.
What port does HTTPS use?
HTTPS listens on port 443 by default.
Is port 443 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 443
Test-NetConnection HOST -Port 443
nmap -p 443 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Low risk — designed for public exposure
Port 443 (HTTPS) is designed for public exposure. Standard hardening (TLS certs, current firmware, sensible rate limits) is enough — no special isolation needed.
Devices that use port 443
10 devices in our database expose a service on port 443.
Related ports
Frequently asked
What is port 443 used for?+
Port 443 is the standard TCP/UDP port for HTTPS. HTTP over TLS — the modern default for the web.
What port does HTTPS use?+
HTTPS listens on port 443 by default.
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