What This Port Is
Port 3473 sits in the registered port range (1024–49151), the middle tier of the port number system. Ports in this range aren't reserved for the Internet's core protocols — those live below 1024 — but they're not completely wild either. Organizations and developers can register them with IANA to claim a number for their software.
Port 3473 is registered. Its official entry reads:
jaugsremotec-2 — JAUGS N-G Remotec 2 Assigned April 2002 by Steven B. Cliff TCP and UDP
That's the entirety of the public record.
The Ghost Registration
There is no RFC for JAUGS N-G Remotec 2. No documentation. No source code. No forum posts asking for help configuring it. The "JAUGS" organization, whatever it was, left no public footprint. "N-G" likely meant "next generation." "Remotec" suggests some kind of remote control or remote communications protocol. Port 3472 holds "JAUGS N-G Remotec 1" — the same registrant, same date, presumably version 1 of the same thing.
What happened to it? The most likely explanation: a small organization registered the ports in anticipation of releasing software that was either never finished, never widely deployed, or used only internally and then abandoned.
This is not unusual. The registered port range contains hundreds of ports like this — claimed during the early 2000s by projects that quietly disappeared. IANA doesn't reclaim ports. The registry preserves them forever, names intact, long after anyone cares.
What Might Actually Be on This Port
Since the registered service never materialized publicly, anything running on port 3473 today is something else entirely. Common possibilities:
- Custom application traffic — internal tools, game servers, or proprietary software that needed a port and picked an obscure registered number that nobody uses
- Nothing — on most machines, this port is simply closed
If you're seeing unexpected traffic on port 3473, it's worth investigating. The registered service isn't running anywhere meaningful.
How to Check What's Listening
On Linux or macOS:
On Windows:
If something is listening, the process ID will tell you what it is.
With nmap (remote scanning):
The -sV flag attempts service version detection — useful when the service doesn't announce itself.
Why Ghost Registrations Matter
Port 3473 illustrates something worth understanding about the registered port range: a registered port isn't a running service. It's a reservation — like a business name filed with a state registry for a company that never opened.
Firewalls that block "all ports except known services" often use lists derived from the IANA registry. A ghost registration can create a false sense of safety — the port looks legitimate, so traffic on it might get waved through. In practice, you should treat unknown traffic on any port, registered or not, with equal suspicion.
The port number system works best when registrations correspond to actual, documented protocols. Port 3473 is a small reminder of what happens when they don't.
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