Port 2392: Tactical Auth — A Registered Ghost

What Port 2392 Is

Port 2392 sits in the registered port range (1024–49151), the middle tier of the port numbering system. Below it: the well-known ports (0–1023), reserved for foundational services like HTTP, DNS, and SSH. Above it: the ephemeral ports (49152–65535), handed out temporarily by operating systems for outgoing connections.

Registered ports exist for applications that need a consistent, predictable address — a port a server can listen on reliably, and that clients can connect to without guessing. Companies and developers apply to IANA to claim one.

Someone claimed port 2392.

The IANA Assignment

According to the IANA Service Name and Transport Protocol Port Number Registry, port 2392 is assigned to "Tactical Auth" on both TCP and UDP. The registrant is listed as David Yon, with a contact at tactical-sw.com.¹

That's where the paper trail ends.

There is no RFC. No published protocol specification. No open-source implementation. No forum posts from engineers debugging a "tactical auth" connection. The service was registered — which means it exists in the global authoritative record — but it left no visible footprint in the public Internet.

This happens more than you'd expect. The registered port range has thousands of entries. Some were claimed by products that never shipped. Some by internal enterprise tools that never needed to be public. Some by software that quietly disappeared. The registry is a historical record as much as it is an active directory.

What You Might Actually Find on Port 2392

If you see traffic on port 2392 on a modern system, it's almost certainly not "Tactical Auth." More likely candidates:

• Custom internal applications — developers picking ports that appear "unoccupied"
• Gaming traffic — ports 2300–2400 have historically been used by DirectX 7-era games and GameSpy-connected titles including Age of Empires II²
• Misconfigured software — something that picked an arbitrary registered port without checking the registry

Checking What's Listening

If port 2392 is open on a system you're investigating:

On Linux/macOS:

ss -tlnp | grep 2392
# or
lsof -i :2392

On Windows:

netstat -ano | findstr :2392

The output will show the process ID (PID) holding the port open. From there, you can look up the process name to identify what's actually running.

Why Unassigned (and Obscure-Assigned) Ports Matter

The port registry is a coordination mechanism, not an enforcement mechanism. Nothing stops software from binding to any port it wants. The registry exists so that when two different applications try to use the same port, there's a shared reference to resolve the conflict.

But coordination only works when everyone participates. Thousands of registered ports are effectively abandoned — claimed in the registry but running no active, publicly-known service. They sit there like reserved parking spots for cars that never arrived.

Port 2392 is one of them. Officially spoken for. Practically available.