{
  "id": "port/21",
  "family": "port",
  "slug": "21",
  "title": "Port 21 — ftp",
  "summary": "Well-known port 21 (tcp/udp/sctp): File Transfer Protocol [Control]. Service name: ftp. Referenced in RFC959, RFC9260.",
  "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": 21,
    "reference_rfcs": [
      "RFC959",
      "RFC9260"
    ],
    "transports": [
      "tcp",
      "udp",
      "sctp"
    ],
    "raw_columns": {
      "Service Name": "ftp",
      "Port Number": "21",
      "Transport Protocol": "tcp",
      "Description": "File Transfer Protocol [Control]",
      "Assignee": "[Jon_Postel]",
      "Contact": "[Jon_Postel]",
      "Registration Date": "",
      "Modification Date": "",
      "Reference": "[RFC959]",
      "Service Code": "",
      "Unauthorized Use Reported": "",
      "Assignment Notes": "Defined TXT keys: u=<username> p=<password> path=<path>"
    }
  },
  "updated": "2026-05-29"
}