port 443

Port 443 — HTTPS

443 is the standard encrypted web port. It is one of the few port-specific pages with strong standalone intent and distinct technical content.

Approved intentUnderstand port 443 used by HTTPS/TLS.

Open in the catalogThe Port Finder search below already comes prefilled with `443`, showing protocol, security, RFCs and category on first load.

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portFinder.protocolportFinder.rangeportFinder.categoryportFinder.security

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443TCPportFinder.securities.secureportFinder.encrypted
HTTPS — HTTP over TLS
Encrypted web (TLS 1.2/1.3). Also used by HTTP/3 over QUIC (UDP 443).
portFinder.categories.webRFC 9110RFC 8446
53TCP/UDPportFinder.securities.varies
DNS — Domain Name System
Name resolution. UDP for normal queries, TCP for zone transfers and large answers. DoT (853) and DoH (443) encrypt.
portFinder.categories.networkRFC 1035portFinder.secureAlternative
80TCPportFinder.securities.insecure
HTTP — HyperText Transfer Protocol
Cleartext HTTP. In production always use HTTPS (443).
portFinder.categories.webRFC 9110portFinder.secureAlternative

portFinder.privacyNote

What 443 means

TCP port 443 is used by HTTPS, usually HTTP over TLS 1.2/1.3.
HTTP/3 uses QUIC over UDP 443, so modern firewalls often need to consider both TCP and UDP.

Typical reverse proxy use.

Evaluate UDP/443 if using HTTP/3.

The port indicates expected TLS usage, but real security depends on certificates, TLS settings and the application.

Cleartext HTTP uses 80; HTTPS uses 443.