Port 443 (HTTPS / QUIC) – TCP/UDP

TCP Yes

UDP Yes

SCTP —

DCCP —

What it is

HTTP over TLS (TCP) for HTTP/1.x and HTTP/2; HTTP/3 uses QUIC over UDP/443.

The dominant web port. Open both TCP and UDP if you serve HTTP/3.

Transport	Status	Meaning
TCP	Yes	Assigned by IANA and standardized, specified, or widely used on this port.
UDP	Yes	Assigned by IANA and standardized, specified, or widely used on this port.
SCTP	—	Not applicable for this transport.
DCCP	—	Not applicable for this transport.

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Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

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