Port 2852: bears-01 — Registered, Unexplained

What This Port Is

Port 2852 sits in the registered ports range (1024–49151). These ports are assigned by IANA upon request, typically for specific applications or services that want a stable, recognized home on the network.

IANA lists port 2852 as bears-01, assigned to a registrant named Bruce McKinnon, available on both TCP and UDP. That is the entirety of the public record. No RFC was ever published for it. No software documentation references it. No widely deployed service is known to use it.

It has a name. It has an owner on file. It has no explanation.

What "Registered" Actually Means

A registered port assignment does not guarantee that a service is deployed, documented, or even ever shipped. IANA maintains a registry — not a guarantee. Anyone can request a port assignment; not all of them become real products. Many registered ports sit dormant, claimed for internal tools, abandoned projects, or services that never left a private network.

Port 2852 appears to be one of these. The registration exists. The service, publicly at least, does not.

What Might Be Running Here

If you find port 2852 open on a machine you manage, it is almost certainly not "bears-01" — it is whatever application or service happened to bind to an available port. Common causes:

• Development servers — frameworks and tools often pick available ports dynamically or from configuration
• Internal proprietary software — enterprise tools frequently use registered ports without being the registrant
• Peer-to-peer applications — some bind to high-numbered ports opportunistically

How to Check What Is Listening

On Linux or macOS:

# Show what process is using port 2852
sudo lsof -i :2852

# Or with ss
sudo ss -tlnp sport = :2852

On Windows:

netstat -aon | findstr :2852

The process name and PID will tell you what is actually there. Cross-reference the PID with Task Manager or ps aux to identify the application.