Port 2595 sits in the registered ports range and technically has a name. IANA lists it as World Fusion 1 (service identifier: worldfusion1) on both TCP and UDP. Beyond that name, the trail goes cold. No RFC. No protocol specification. No known software deployments. No company still operating under that name. The entry exists in the registry, and nowhere else.1
This is more common than you might expect.
The Registered Ports Range
Port 2595 falls in the registered ports range: 1024–49151. These ports are tracked by IANA, and any organization can apply to claim one for their service. Registration doesn't require an open standard, a published specification, or even a shipping product — just an application and a name.
The result is a registry full of ghost towns. Services were registered, the software was never widely deployed (or was deprecated, acquired, or abandoned), and the port number sits there indefinitely with a name attached to nothing.
Port 2595 appears to be one of these. "World Fusion 1" was registered at some point, and nothing followed.
What's Actually on Port 2595
On any given machine, probably nothing — unless something on your system has claimed it. Port numbers in the registered range are available for use by any application, whether or not it matches the IANA name. The registration is advisory, not enforced.
Custom applications, game servers, development tools, and internal services routinely bind to ports like 2595 simply because they're available and uncontested in practice.
How to Check What's Listening
If you want to know what's using port 2595 on a machine, the answer is one command away:
macOS / Linux:
Linux (alternative):
Windows:
The output will show the process name and PID if anything is bound to the port. If the output is empty, nothing is listening.
Why Ghost Registrations Matter
The IANA registry serves as a coordination layer — a way to prevent two widely-deployed services from accidentally choosing the same port. When a registration is abandoned and the service vanishes, the port number becomes informally available again. But it stays in the registry, which can create confusion: a port scanner might flag port 2595 as suspicious simply because it has a registered name, even though no one knows what that name was supposed to mean.
This is the slow entropy of the port space. Forty years of software companies registering ports, going out of business, getting acquired, or simply moving on — and IANA's registry accumulating names that no longer correspond to anything running anywhere.
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