{
  "port": 50001,
  "protocol": "tcp",
  "service": "Unassigned (dynamic range)",
  "oneLiner": "No assignment and no standard service; in practice the second port in a 50000-based block.",
  "whatItIs": "50001 has no IANA registration — the registry ends at 49151 and RFC 6335 closes everything above to assignment — and Nmap's service database lists it as unknown. Where it does appear, it is usually the next number after a deliberately chosen 50000: a second Db2 instance, a second application listener, or a container publishing a small block of ports. Nothing about the number implies a protocol.",
  "exposure": {
    "verdict": "careful",
    "note": "Identify the service first. If it turns out to be a database or admin listener next to a 50000 sibling, treat it as never."
  },
  "checkCommand": "nmap -Pn -sV -p 50000-50001 TARGET",
  "links": [
    {
      "title": "RFC 6335 — IANA Procedures for Service Name and Transport Protocol Port Number Registry",
      "url": "https://www.rfc-editor.org/rfc/rfc6335.html",
      "kind": "spec"
    },
    {
      "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"
    }
  ]
}