{
  "port": 1783,
  "protocol": "tcp",
  "service": "Unassigned (decommissioned)",
  "oneLiner": "A rare thing in the port registry — an assignment that was taken back. 1783 is officially nobody's.",
  "whatItIs": "IANA's registry carries no service name for 1783. The entry reads only \"Decomissioned Port 04/14/00\" (IANA's spelling), meaning the original assignment was withdrawn in April 2000 and never reissued to anyone. There is no protocol to describe. Anything listening here is a locally chosen port, and no scanner's service guess for 1783 is based on a registration.",
  "exposure": {
    "verdict": "careful",
    "note": "With no assignment at all, the port name tells you nothing — find the listening process on the host and judge that software, not the number."
  },
  "checkCommand": "nc -vz -w 3 TARGET 1783",
  "links": [
    {
      "title": "IANA port registry — 1783 (decommissioned, no service name)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1783",
      "kind": "iana"
    }
  ]
}