{
  "port": 49999,
  "protocol": "tcp",
  "service": "Unassigned (dynamic range)",
  "oneLiner": "No IANA assignment and no known standard service — a round number people pick for ad-hoc listeners.",
  "whatItIs": "49999 is in the Dynamic/Private range that RFC 6335 excludes from registration, and Nmap's service database has no name for it. Its only notable property is that it is memorable, which is why it shows up as a hand-chosen port for temporary tunnels, test servers, and internal tooling. There is no protocol you can assume from the number; fingerprint whatever answers.",
  "exposure": {
    "verdict": "careful",
    "note": "Whatever is here was chosen by a human, often for something temporary and unauthenticated. Verify what it is before allowing it anywhere."
  },
  "checkCommand": "nmap -Pn -sV -p 49999 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"
    }
  ]
}