{
  "port": 55600,
  "protocol": "tcp",
  "service": "Unassigned (dynamic range)",
  "oneLiner": "Unregistered, unnamed, and near the top of the obscure-high-port frequency band.",
  "whatItIs": "55600 carries no IANA assignment, since RFC 6335 excludes the whole 49152-65535 range from registration. Nmap's nmap-services lists it \"unknown\" at 0.000760 for TCP and 0.000502 for UDP — a comparatively high figure that puts it comfortably inside the default top-1000 scan, but says nothing about what is behind it. SANS ISC records probes against it with no service name attached. That is the entire documented record.",
  "exposure": {
    "verdict": "careful",
    "note": "A relatively high observed-open rate makes this a port scanners will try. Do not leave an unidentified service on it facing the internet."
  },
  "checkCommand": "nc -vz -w 3 TARGET 55600",
  "links": [
    {
      "title": "RFC 6335 — Dynamic Ports (49152-65535)",
      "url": "https://www.rfc-editor.org/rfc/rfc6335.html",
      "kind": "spec"
    },
    {
      "title": "IANA port registry — search 55600",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=55600",
      "kind": "iana"
    },
    {
      "title": "nmap/nmap — nmap-services frequency data",
      "url": "https://github.com/nmap/nmap/blob/master/nmap-services",
      "kind": "github"
    }
  ]
}