What Range This Port Belongs To
Port 3178 sits in the registered ports range (1024–49151), also called user ports. Unlike well-known ports (0–1023), registered ports don't require root privileges to bind — any application can use them. They're registered with IANA on a first-come, first-served basis by organizations that want a stable, official home for their software.
The registered range is vast. Most of its 48,000+ ports are actively used. Some are famous: 3306 for MySQL, 3389 for Remote Desktop, 3478 for STUN. Port 3178 is not one of those.
The Official Assignment
According to the IANA Service Name and Transport Protocol Port Number Registry, port 3178 is assigned to:
- Service name:
radclientport - Description: Radiance UltraEdge Port
- Protocols: TCP and UDP
This sounds official because it is — someone filed the paperwork. But searching for "Radiance UltraEdge" returns nothing: no company website, no product page, no documentation, no user forum posts. The software either never shipped widely, was renamed before launch, or was quietly abandoned. The IANA registration outlived everything else.
This happens. The registry is permanent; products are not. 1
What You'll Actually Find Here
In real-world network scanning, port 3178 shows up occasionally — but not because of Radiance UltraEdge. When you see something listening on port 3178, it's almost certainly:
- A custom application that picked an obscure registered port to avoid conflicts
- Malware using an inconspicuous port to blend in
- A misconfigured service that drifted here accidentally
None of these are the official assignee.
How to Check What's Listening
If port 3178 is open on your machine and you want to know why:
On Linux or macOS:
On Windows:
The output will show you the process ID. Cross-reference it with your process list (ps aux or Task Manager) to find the actual program.
If you see port 3178 open on a server you manage and don't recognize the process — investigate. An unrecognized listener on any port is worth understanding.
Why Unassigned (or Abandoned) Ports Matter
The port registry is a coordination mechanism, not an access control system. Registering a port doesn't prevent others from using it, and not registering a port doesn't prevent you from binding to it. The registry just tells the world "this is what we intended here."
When an assignment becomes a ghost — the product gone, the registration staying — that port drifts into ambiguity. It's technically claimed, so other software should avoid it. But nobody is enforcing that, and nobody is using it for the original purpose either.
Port 3178 is one of hundreds of registered ports in this state: claimed on paper, empty in practice, available to whoever finds it first.
Frequently Asked Questions
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