{
  "id": "dns-rrtype/ISDN",
  "family": "dns-rrtype",
  "slug": "ISDN",
  "title": "ISDN — for ISDN address (type 20)",
  "summary": "DNS resource record type ISDN (numeric type 20): for ISDN address. Defined in RFC1183.",
  "kind": "rrtype",
  "status": "standard",
  "verification": "verified",
  "tier": "A",
  "source_url": "https://www.iana.org/assignments/dns-parameters/dns-parameters-4.csv",
  "source_version": "IANA registry, Last-Modified: Mon, 29 Dec 2025 20:21:25 GMT",
  "retrieved_date": "2026-05-29",
  "ext_type": "iana-registry-row@1",
  "ext": {
    "value": 20,
    "reference_rfcs": [
      "RFC1183"
    ],
    "raw_columns": {
      "TYPE": "ISDN",
      "Value": "20",
      "Meaning": "for ISDN address",
      "Reference": "[RFC1183]",
      "Template": "",
      "Registration Date": ""
    }
  },
  "updated": "2026-05-29"
}