Port 3476 sits in the registered port range (1024–49151), where organizations and companies stake claims to port numbers for their services. IANA assigned this port to NVIDIA in April 2002 under the service name nppmp — NVIDIA Management Protocol — on both TCP and UDP.1
Beyond the registration, there's almost nothing. No RFC. No public specification. No traffic reports. No community discussion of services listening here in the wild.
This makes port 3476 a small artifact of an era when hardware and software companies routinely registered ports for internal management protocols that never became widely documented or deployed outside private infrastructure.
The Registered Port Range
Ports 1024 through 49151 are "registered ports" — the middle tier of the port numbering system. Unlike well-known ports (0–1023), they don't require privileged access to bind. Unlike ephemeral ports (49152–65535), they're intended for named, persistent services.
IANA maintains the registry.2 Registration is voluntary, not enforced. A company registers a port to signal intent and stake a claim — to prevent conflicts with other services. Whether the protocol ever ships, and whether anyone outside the company ever sees traffic on it, is another matter entirely.
Port 3476 was claimed. It was never widely inhabited.
Is Anything Actually Listening Here?
Probably not, unless you're on a network with very specific NVIDIA infrastructure. To check your own system:
macOS / Linux:
Windows:
If nothing comes back, nothing is listening. That's the expected result for the vast majority of systems.
Why This Matters
The registered port range has over 48,000 addresses. Many are assigned; many are dark. Some registrations reflect active protocols with millions of daily connections. Others, like this one, represent intentions that never fully materialized into deployed services.
That's not a flaw in the system — it's the system working as designed. The registry exists to prevent collision, not to guarantee activity. A registered port is a reservation, not a promise.
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