Port 2596: World Fusion 2 — A Ghost in the Registry

What Port 2596 Is

Port 2596 is registered with IANA under the service name worldfusion2, assigned to a company called World Fusion for a product called "World Fusion 2." The registration covers both TCP and UDP.

In practice, the service appears to be defunct. The company's website offers nothing meaningful. There are no known deployments, no documented protocol, no RFC. The port exists in the registry but not in the world.

The Registered Ports Range

Port 2596 sits in the registered ports range: 1024–49151.

This range was designed for software vendors and services to stake a claim — to say "this is ours, don't use it for something else." IANA maintains the list. Getting registered requires submitting an application, not demonstrating ongoing use.

The tradeoff is visible here. Registered doesn't mean active. It means someone once filed the paperwork.

Why Ghost Assignments Happen

The IANA registry has no expiration date. A company registers a port, ships a product, folds, gets acquired, or simply abandons the software — and the port number stays assigned indefinitely. No mechanism reclaims it.

Port 2596 is one of many in this situation. The number will belong to World Fusion 2 until IANA is formally asked to reassign it, which rarely happens.

For administrators, this matters in one practical way: if something unexpected shows up on port 2596, it isn't "World Fusion 2." It's something else using an obscure, seemingly vacant number.

What to Do If You See Traffic on Port 2596

If you find a process listening on port 2596, it's almost certainly not the registered service. Check what's actually there:

On Linux/macOS:

# Show which process is listening on port 2596
sudo ss -tlnp | grep 2596
# or
sudo lsof -i :2596

On Windows:

# Show process listening on port 2596
netstat -ano | findstr :2596
# Then look up the PID
tasklist | findstr <PID>

The name of the process will tell you more than the port number ever could.