Port 2586: NETX Agent — A registered port with a missing story

What Port 2586 Is

Port 2586 sits in the registered port range (1024–49151), the middle tier of the port numbering system. IANA maintains this range for services that apply for an assignment — it requires someone to fill out a form, provide a contact, and stake a claim.

Port 2586 has such a claim. According to the IANA Service Name and Transport Protocol Port Number Registry, it is assigned to NETX Agent (service name: netx-agent), on both TCP and UDP, with Brett Dolecheck listed as the registrant.¹

That's where the trail ends.

What NETX Agent Is (or Was)

There is almost no public documentation about NETX Agent. The name doesn't correspond to any widely-known software. Dolecheck appears in professional records as a senior engineering director with a background at companies including Adaptec and Honeywell — someone who clearly works in technical infrastructure — but no public project or product named NETX Agent has a visible presence.

A few possibilities:

• Internal enterprise software that was registered for interoperability but never released publicly
• Abandonware from a product that didn't survive
• A name collision with other "NetX" projects (Renesas makes a TCP/IP stack called NetX for embedded systems; the open-source NetXMS monitoring platform uses different ports entirely)

Without more information, this port is effectively a registered ghost — it holds a name, but the name has no body.

What the Registered Range Means

The registered port range exists because the alternative is chaos. Without it, two applications might independently choose the same port and conflict on every machine that runs both. Registering with IANA doesn't guarantee a port will be used — but it does mean no one else will accidentally claim the same number for a different purpose.

This is why unassigned and obscure ports still matter: they represent slots in a finite numbering system (0–65535) that are either waiting to be used, have been used and forgotten, or are actively claimed by software that operates outside public view.

What Might Be on This Port in Practice

On any given machine, port 2586 is almost certainly not running NETX Agent. It may be:

• Nothing — most ports are closed on most machines
• Ephemeral traffic — operating systems use ports in the registered range as temporary outbound ports for connections
• Something local — a developer, application, or container that chose this port for its own purposes

How to Check What's Listening

To see if anything is using port 2586 on your machine:

Linux / macOS:

# Show what process is listening on port 2586
ss -tlnp | grep 2586

# Or with lsof
lsof -i :2586

Windows:

netstat -ano | findstr :2586

If something is listening and you don't recognize it, cross-reference the process ID (PID) against your running processes. An unknown listener on a registered port is worth investigating — it could be legitimate software, a misconfigured service, or something that shouldn't be there.