Port 2765: Unassigned — A Slot in the Registry That Nobody Claimed

What This Port Is

Port 2765 is unassigned. The Internet Assigned Numbers Authority (IANA) — the organization that maintains the official registry of port numbers — has no record of any service, protocol, or application claiming this port.¹

That is the complete official story.

The Range It Belongs To

Port 2765 falls in the registered ports range: 1024 through 49151.

Here is how the three ranges differ:

Registered ports exist so that a software application — a database, a game server, a collaboration tool — can say "we always live at port X" and have that address recorded somewhere official. Port 2765 is a slot in that registry that nobody has ever filed paperwork to claim.

The registered range has 48,127 ports. Most of them are empty.

Known Unofficial Uses

No widely documented unofficial use exists for port 2765. Security scanning databases flag it with generic "possible trojan/malware" language — but this warning appears on hundreds of unassigned ports and reflects the scanner's logic ("unknown open port = suspicious"), not any specific threat associated with 2765 itself.²

If you see port 2765 open on a system you manage, investigate it. But don't assume the port number itself means anything.

How to Check What Is Listening

On Linux or macOS:

# Show which process has port 2765 open
sudo ss -tlnp sport = :2765

# Alternative using lsof
sudo lsof -i :2765

On Windows:

# Show PID listening on port 2765
netstat -ano | findstr :2765

# Look up the process by PID
tasklist | findstr <PID>

On macOS (alternative):

sudo lsof -nP -iTCP:2765 -sTCP:LISTEN

The output will tell you the process name and PID. From there, you can determine whether you recognize the application — and whether it belongs.

Why Unassigned Ports Matter

The port registry is not a complete map of what runs on the Internet. It is more like a property registry — it records who filed a claim, not who is actually using the land.

Applications regularly operate on unassigned ports by convention, configuration, or default. Development tools, internal services, and proprietary software frequently pick numbers from the registered range without ever notifying IANA. This is legal, common, and occasionally a source of conflict when two applications independently choose the same port.

Port 2765's emptiness is not unusual. It is the normal state of most registered port numbers.