Internet TCP port 853 is primarily used by DNS over TLS (DoT), a security protocol for encrypting and wrapping Domain Name System (DNS) queries and answers via the Transport Layer Security (TLS) protocol. Notable examples of software that use this port include Stubby, an open-source DNS stub resolver, and Unbound, a validating, recursive, and caching DNS resolver. Additionally, public DNS servers like Cloudflare's 1.1.1.1 also utilize port 853 for secure DNS queries.
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