{
  "port": 9621,
  "protocol": "tcp",
  "service": "Unassigned",
  "oneLiner": "No IANA assignment, no documented service — an unclaimed high port.",
  "whatItIs": "IANA has no registration for 9621 on TCP or UDP, and Nmap records it as `unknown` at a very low frequency. Nothing standard, no product default, and no well-documented malware claims it. A listener here is an application that picked an arbitrary free port, so the useful move is to find the owning process rather than look the number up.",
  "exposure": {
    "verdict": "careful",
    "note": "Unknown service, unknown risk. Identify the process first; an unlabelled high port is frequently something that was never meant to leave localhost."
  },
  "checkCommand": "sudo lsof -nP -iTCP:9621 -sTCP:LISTEN",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml",
      "kind": "iana"
    }
  ]
}