Port 2265: Unassigned — A Gap in the Registry

Port 2265 has no official service. IANA, the organization that manages port assignments, lists it as unassigned — meaning no protocol has claimed it through the formal registration process, and no software has made it famous enough to earn an informal one.¹

What Range This Port Belongs To

Port 2265 falls in the registered port range: 1024 through 49151.

The port number space is divided into three bands:

• Well-known ports (0–1023): Assigned by IANA to foundational protocols — HTTP on 80, HTTPS on 443, SSH on 22. These require elevated privileges to open on most operating systems.
• Registered ports (1024–49151): Available for applications to claim through IANA. Companies and developers register ports here so their software has a stable, recognized home. This is where most application-layer protocols live.
• Dynamic/ephemeral ports (49152–65535): Not registered. Operating systems hand these out temporarily when your computer needs an outgoing connection — your browser uses one of these on your side every time you load a page.

The registered range has 48,127 slots. Many are claimed — database servers, messaging protocols, enterprise software, game servers. Many are not. Port 2265 is one of the unclaimed ones.

Any Known Unofficial Uses

No widely observed unofficial use has been documented for port 2265. Port reference databases return no notable entries.² It doesn't appear in common malware profiles, application defaults, or informal community conventions.

This is simply an empty space in the registry.

How to Check What's Listening on This Port

If you're seeing traffic on port 2265 on your own system, something specific to your environment is using it. Here's how to find out what:

On Linux or macOS:

# Show what process is listening on port 2265
ss -tlnp sport = :2265

# Or with lsof
lsof -i :2265

On Windows:

# Show listening processes with port and PID
netstat -ano | findstr :2265

# Then look up the PID
tasklist | findstr <PID>

The output will tell you the process name and ID. From there, you can trace it back to whatever software opened the port.

Why Unassigned Ports Matter

The registered port range exists so that software has stable, predictable addresses. When an application registers a port, other software knows where to find it — the same way a business registers a phone number so customers can call.

Unassigned ports are the gaps between those registrations. They're not dangerous on their own. But because nothing is supposed to be there by default, anything listening on an unassigned port is worth a second look. It could be legitimate software that simply never registered. It could be something configured manually. Or it could be something that shouldn't be there at all.

The presence of traffic on an unassigned port is a question mark, not an alarm — but it's a question worth answering.