Port 2634: PK Electronics — A Name Without a Protocol

What Port 2634 Is

Port 2634 sits in the registered ports range (1024–49151), also called user ports. IANA lists it as pk-electronics, assigned to something called "PK Electronics," with a registrant named Seb Ibis.¹

That's where the trail ends. There is no RFC. No protocol documentation. No known software that announces itself on this port. No security advisories referencing it. PK Electronics appears to be what happens when someone files for a port assignment and the service either never shipped, stayed entirely internal, or quietly disappeared.

What the Registered Range Means

Ports 1024–49151 are registered ports. Unlike the well-known ports below 1024 (which require root/admin privileges and host foundational protocols like HTTP on 80 or SSH on 22), registered ports can be requested by any organization with a service to name.

The registration process is lightweight. IANA doesn't require working code or public documentation—just a name, a contact, and a description of intended use.² This means the registered range is littered with ports like 2634: technically claimed, practically inert. They're placeholders. Reservations for services that may never have existed at scale.

Is Anything Actually Using It?

The registration tells you nothing about what's running on port 2634 on your system. Any application can bind to any unoccupied port, registered or not.

To check what's listening on port 2634:

macOS / Linux:

sudo lsof -i :2634

Windows:

netstat -ano | findstr :2634

If nothing is listed, nothing is listening. If something shows up, the process name and PID will tell you more than the IANA registry ever could.

Why Ghost Registrations Exist

The IANA port registry was designed to prevent collisions—two services accidentally choosing the same port and fighting over it. Registration is a declaration of intent, not a proof of deployment.

Over decades, organizations registered ports for internal tools, proprietary protocols, and products that never reached the public. The registrations outlived the services. Some ports were registered speculatively. Some were registered by companies that no longer exist. The registry preserves them all, indefinitely, because removing a registration risks re-assigning a port that something, somewhere, might still quietly use.

Port 2634 is one of hundreds like it: named, claimed, and forgotten.