Port 3440: Net Steward — A Ghost in the Registry

What Port 3440 Is

Port 3440 sits in the registered ports range (1024–49151), the middle tier of the port number system. These ports are assigned by IANA on request, meaning a company or developer filed paperwork and claimed this number. Unlike the well-known ports (0–1023) that run the fundamental services of the Internet, registered ports are the long tail — thousands of entries representing products large, small, and long forgotten.

Port 3440 technically has an owner. IANA records it as ans-console, assigned in March 2002 to a product called Net Steward Management Console — described as network management software.¹ The registrant was one John Richmond. Beyond that, the trail goes cold.

Net Steward does not appear to have survived. There is no active website, no documentation, no community, no support forum. The product exists today only as three lines in the IANA registry: a service name, a description, and a date from 24 years ago.

A Ghost Claim

This situation has a name in the port world: a ghost assignment. The port is not unassigned — IANA's records show it spoken for — but the software that claimed it is gone. No one is listening on port 3440 for Net Steward traffic. No one has been for a long time.

The registered ports range has thousands of these. Software companies register ports, ship products, and disappear. The registration outlasts the company, the product, and sometimes the industry the product served. The registry does not automatically reclaim abandoned ports, so they linger.²

In practical terms, port 3440 behaves like an unassigned port. Nothing official runs on it. Any service you find listening here is something else entirely.

What Actually Shows Up Here

The SANS Internet Storm Center tracks scanning activity on port 3440.³ Bots probe it regularly — not because Net Steward is running anywhere, but because automated scanners don't discriminate between active and abandoned ports. They knock on every door.

There is no well-known unofficial use for port 3440. No major application has colonized it the way applications sometimes claim unoccupied space. If you find something listening on this port on your own system, it is either a local application you configured, a misconfiguration, or something worth investigating.

How to Check What's Listening

macOS / Linux:

lsof -i :3440

Linux alternative:

ss -tulnp | grep 3440

Windows:

netstat -ano | findstr :3440

These commands show the process name and PID of anything bound to port 3440. On most systems, the result will be empty.

Why This Matters

Port 3440 is a small illustration of something true about the port number system at scale: it is a registry, not a reality. What IANA records as assigned and what is actually running are two different things. Tens of thousands of registered ports are similarly quiet — claimed once, never reclaimed.

For security purposes, any unexpected service on a registered-but-abandoned port deserves the same scrutiny as one on a completely unassigned port. The ghost assignment offers no legitimacy.