{
  "port": 19842,
  "protocol": "tcp",
  "service": "Unassigned",
  "oneLiner": "Unassigned by IANA and unnamed in Nmap's table — a top-1000 scan port with no service behind it.",
  "whatItIs": "19842 sits in the same unassigned IANA block as 19801 (19791-19997) and has no registration of any kind. Nmap records a nonzero open-frequency for it from internet-wide scanning, so it is included in the default 1000-port scan, but the service column reads 'unknown'. Anything found open here is site-specific: an in-house daemon, a relocated service, or a mapped container port. There is no protocol to describe.",
  "exposure": {
    "verdict": "careful",
    "note": "Judge the listener, not the port number. Run a version scan and decide from what actually answers."
  },
  "checkCommand": "nmap -Pn -sV -p 19842 --reason TARGET",
  "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"
    },
    {
      "title": "Nmap nmap-services frequency table",
      "url": "https://github.com/nmap/nmap/blob/master/nmap-services",
      "kind": "github"
    }
  ]
}