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UDP 853

ProtocolUDP
Port853
Labelsdomain-s, DNS over TLS

Synopsis

  • UDP port 853 is used by DNS over QUIC (DoQ), standardized in RFC 9250.
  • Public resolvers that listen on UDP/853 for DoQ include Cloudflare’s 1.1.1.1, Quad9 (9.9.9.9), AdGuard DNS, and NextDNS.
  • Resolver/server software implementing DoQ on UDP/853 includes Unbound, Knot Resolver, and Technitium DNS Server.
  • DNS proxies/load balancers with DoQ support on UDP/853 include PowerDNS dnsdist and AdGuard’s dnsproxy.
  • Many deployments use these to provide encrypted DNS transport over UDP/853 between clients/forwarders and upstream resolvers.

Observed activity

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