Port 2297: D2K DataMover 1 — An Assigned Port with a Missing Owner

What This Port Is

Port 2297 sits in the registered ports range (1024–49151), the middle tier of the port numbering system. IANA maintains this range for services that have formally applied for an assignment — meaning a company or project filled out the paperwork, made their case, and got a number reserved.

Port 2297's assignment: d2k-datamover1 — D2K DataMover 1, on both TCP and UDP. Port 2298 is its sibling, D2K DataMover 2.

The problem: nobody can find D2K DataMover anymore. No active website. No documentation. No company behind it. The software appears to have been an enterprise data movement tool from a company that no longer exists, leaving behind nothing but an entry in the IANA registry and a pair of port numbers with nowhere to go.¹

What This Means in Practice

The registered ports range is full of these ghost assignments. A product gets built, a port gets registered, the company folds or the software gets discontinued — and the port number stays on the books indefinitely. IANA doesn't automatically reclaim registrations, so port 2297 will likely remain officially "assigned" to D2K DataMover 1 long after the last person who ran that software is gone.

For practical purposes, treat port 2297 as unassigned. No mainstream application uses it. No firewall rule needs to permit it by default. If you see it active on a system, something specific is using it — and you should find out what.

How to Check What's Listening

If port 2297 shows up in your environment, these commands will tell you what's using it:

On Linux/macOS:

# Show the process listening on port 2297
ss -tlnp | grep 2297

# Or with lsof
lsof -i :2297

On Windows:

# Show process ID and name for port 2297
netstat -ano | findstr :2297

The output will give you a process name or PID. From there, you can determine whether it's something you intentionally installed or something that warrants investigation.

Why Unassigned Ports Matter

The port system is a namespace — 65,535 slots, each potentially a door into a service. The registered range exists so that well-known applications have stable, predictable homes. When a port in this range is active and you don't know why, it matters: it could be legitimate software using the port informally, a misconfigured service, or something more concerning.

Ghost assignments like port 2297's are a reminder that the registry is a historical document as much as an active directory. The Internet keeps running long after the companies that helped build it are gone.