What Range This Port Lives In
Port 3359 falls in the registered ports range (1024-49151). These ports are managed by IANA, the Internet Assigned Numbers Authority, which maintains a global registry of service names and port numbers. Unlike well-known ports (0-1023), registered ports don't require root or administrator privileges to bind — any process can use them.
The registered range is enormous: over 48,000 ports. Most of them are either obscure legacy assignments, niche enterprise software, or effectively empty. Port 3359 is firmly in that category.
The Official Assignment: WG NetForce
According to the IANA registry, port 3359 is assigned to WG NetForce (service name: wg-netforce), registered by a contact named Lee Wheat.1
The most plausible candidate for what this software does: AMTI makes data acquisition software called NetForce for their multi-axis force plates and load cells, used in biomechanics research — motion capture labs, gait analysis, sports science.2 These are specialty instruments that measure forces applied to surfaces in three dimensions. Port 3359 is apparently how their software communicates over a network.
That said, the connection between "WG NetForce" in the IANA registry and AMTI's NetForce product isn't definitively confirmed. The assignment is sparse: a service name, two protocol entries (TCP and UDP), and a contact. That's it.
What This Means in Practice
Unless you work in a biomechanics lab running AMTI force plate equipment — and you're one of the rare facilities that uses its network communication features — port 3359 is doing nothing on your machine. It isn't listening. Nothing is waiting on it. The assignment in the IANA registry is real, but the running software almost certainly isn't.
This is the normal state of most registered ports. The registry records an intention, not a presence.
How to Check What's Listening on Port 3359
If you want to verify:
On Linux or macOS:
On Windows:
If nothing comes back, nothing is using it. That's the expected result on almost every system.
If something is listening there and you didn't put it there, that's worth investigating. Any process can claim a registered port, which includes malware looking for a quiet corner to work in.
Why Registered Ports Matter
The alternative to a registry is chaos. Before IANA standardized port assignments, different applications would accidentally collide on the same port numbers, breaking each other silently. The registry coordinates intent: if you're building software that needs a port, you register it, and other software knows to stay clear.
In practice, the system works imperfectly. Many registered ports go unused. Many used ports were never registered. But the registry still provides a useful reference point: when you see an unexpected process on port 3359, you can look it up and learn something — even if what you learn is "this is a niche force-measurement protocol that has no business running on your web server."
Frequently Asked Questions
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