{
  "id": "port/853",
  "family": "port",
  "slug": "853",
  "title": "Port 853 — domain-s",
  "summary": "Well-known port 853 (tcp/udp): DNS query-response protocol run over TLS. Service name: domain-s. Referenced in RFC7858, RFC8094, RFC9250.",
  "kind": "port",
  "status": "standard",
  "verification": "verified",
  "tier": "A",
  "source_url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv",
  "source_version": "IANA registry, Last-Modified: Fri, 29 May 2026 01:11:28 GMT",
  "retrieved_date": "2026-05-29",
  "ext_type": "iana-registry-row@1",
  "ext": {
    "value": 853,
    "reference_rfcs": [
      "RFC7858",
      "RFC8094",
      "RFC9250"
    ],
    "transports": [
      "tcp",
      "udp"
    ],
    "raw_columns": {
      "Service Name": "domain-s",
      "Port Number": "853",
      "Transport Protocol": "tcp",
      "Description": "DNS query-response protocol run over TLS",
      "Assignee": "[IESG]",
      "Contact": "[IETF_Chair]",
      "Registration Date": "2015-10-08",
      "Modification Date": "2022-04-11",
      "Reference": "[RFC7858]",
      "Service Code": "",
      "Unauthorized Use Reported": "",
      "Assignment Notes": ""
    }
  },
  "updated": "2026-05-29"
}