Port 2650: eristwoguns — The Port That Was Claimed and Forgotten

What Range This Port Belongs To

Port 2650 sits in the registered ports range (1024–49151), also called user ports. This range is managed by IANA — anyone can apply to reserve a port number for a specific application, and IANA records the assignment in its Service Name and Transport Protocol Port Number Registry.

Reserved doesn't mean active. It means someone asked for it.

The Ghost Registration

Port 2650 is registered with IANA under the service name eristwoguns, on both TCP and UDP. The registration date is December 16, 2008. The assignees are listed as Jason Lockett and Melanie Kacerek.

That's everything that's publicly known.

The name "eristwoguns" doesn't correspond to any documented protocol, open-source project, commercial product, or community tool. There are no RFCs. No GitHub repositories. No forum posts asking how to configure it. Whatever application this port was meant to serve either never launched, died quietly, or was always entirely private.

This is more common than it sounds. The IANA registry has thousands of registrations from small companies and individuals who reserved port numbers for applications that never shipped, companies that no longer exist, or software that was used internally and never described publicly. Port 2650 is one of them.

Known Unofficial Uses

None documented. Port 2650 doesn't appear in any significant malware databases, peer-to-peer application lists, or network monitoring reports with notable frequency. It's genuinely quiet.

If you see traffic on port 2650 in your environment, it isn't following a public standard — it's whatever your specific software decided to use it for.

How to Check What's Listening on This Port

If you want to see whether anything on your system is using port 2650:

macOS / Linux:

lsof -i :2650

or

ss -tulnp | grep 2650

Windows (Command Prompt as Administrator):

netstat -ano | findstr :2650

Then match the PID to a process:

tasklist | findstr <PID>

If nothing is returned, nothing is listening. If something is, the process name will tell you more than the port number ever could.

Why Ghost Registrations Exist

The registered port range was designed to prevent conflicts — if two applications both defaulted to the same port, they'd collide on networks that ran both. Registering a port was supposed to signal: "this is ours."

But the system is voluntary and IANA doesn't police it. You can register a port, never use it, abandon the project, or let the company dissolve — and the entry just stays. The registry doesn't expire registrations automatically.

The result is that a meaningful portion of the registered range is occupied by services no one runs anymore, products that never launched, and names that no one can explain. Port 2650 is honest evidence of this: an official entry, an opaque name, and silence behind the door.