{
  "port": 3476,
  "protocol": "both",
  "service": "nppmp (NVIDIA Mgmt Protocol)",
  "oneLiner": "NVIDIA's management protocol port, registered in 2002 and rarely observed since.",
  "whatItIs": "IANA assigned 3476 to nppmp, \"NVIDIA Mgmt Protocol\", registered by Gilbert Yeung of NVIDIA in April 2002. NVIDIA never published a specification for it, and today's NVIDIA management tooling — nvidia-smi, DCGM, the driver's own control interfaces — does not use this port. Scan data shows it open about as often as any other dormant registration. Treat a listener here as unidentified rather than assuming it is a GPU service.",
  "exposure": {
    "verdict": "careful",
    "note": "No documented protocol means no way to reason about its authentication — identify what is bound before exposing it anywhere."
  },
  "checkCommand": "nmap -Pn -sV -p 3476 TARGET",
  "links": [
    {
      "title": "IANA port registry — 3476 (nppmp)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3476",
      "kind": "iana"
    }
  ]
}