# WHATPORT(3476)

## NAME

port 3476 — nppmp (NVIDIA Mgmt Protocol) — NVIDIA's management protocol port, registered in 2002 and rarely observed since.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

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

**Expose with care.** No documented protocol means no way to reason about its authentication — identify what is bound before exposing it anywhere.

## CHECK

```sh
nmap -Pn -sV -p 3476 TARGET
```

## SEE ALSO

- iana — [IANA port registry — 3476 (nppmp)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3476) (iana.org)

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