Dictionary · Protocols and Ports
QUIC
Web · Advanced
A modern encrypted transport that runs over UDP and carries HTTP/3. It combines transport and encryption setup so a new connection can resume with less delay.
Instead of stacking a reliable stream and then encryption as two separate handshakes, this transport builds encryption in from the start. On the wire it is datagram traffic, usually to port 443.
Example: A browser loads a site with HTTP/3. The packets are UDP to port 443 rather than a traditional reliable connection to that port.
Ports
- UDP 443 — HTTP/3
Common misconception
- Seeing datagrams on port 443 does not automatically mean broken web traffic. The newest web transport is designed that way.