Internet UDP port 443 is commonly used by QUIC (Quick UDP Internet Connections) protocol, which is developed by Google to speed up web browsing. This protocol is used by Google Chrome for experimental purposes. Additionally, some VPN software, like OpenVPN, can be configured to use UDP port 443 to bypass firewall restrictions. Datagram Transport Layer Security (DTLS) also uses this port for securing communication in VoIP services.
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