Port 3199: DMOD WorkSpace — A Ghost Assignment

What Range This Port Belongs To

Port 3199 sits in the registered ports range (1024–49151). These ports require an application to register with IANA, which maintains the official list of who claims what. Unlike the well-known ports (0–1023), registered ports don't require root or administrator privileges to bind — any process can open one.

Registration doesn't mean enforcement. IANA is a registry, not a police force. Registering a port is closer to staking a claim on a map than locking a door.

The Official Assignment: DMOD WorkSpace

IANA lists port 3199 (TCP and UDP) as dmod-workspace, assigned to DMOD WorkSpace — a client-server software product built by DMOD, Inc. for the media production industry.¹

In the early 2000s, DMOD WorkSpace was the kind of software that recording studios and post-production houses used to share digital assets securely over the Internet — with access controls, expiration dates, and persistent rights management baked in. RCA Records used it. Sterling Sound licensed it. NBC's post-production staff relied on it.²

Then the trail goes cold. DMOD, Inc. and its WorkSpace product have left almost no modern footprint. The IANA assignment remains. The company, apparently, does not.

This is not unusual. The registered ports range is full of orphaned claims — software products that were built, registered, and then discontinued, leaving their port numbers behind like forwarding addresses for businesses that no longer exist.

Who Actually Uses It Now

Digi International XBee Gateway — Digi's line of IoT gateway hardware, which bridges XBee wireless sensor networks to the cloud, uses port 3199 TCP for its Remote Manager service. Their official documentation lists it as a required outbound port for devices operating behind a firewall.³ This is unrelated to DMOD; Digi simply uses the port in practice.

There are also historical references to port 3199 appearing in Balboa Water Group spa controller configurations, suggesting some consumer IoT devices have landed here as well.

Scanning Activity

The SANS Internet Storm Center logs periodic scanning activity targeting port 3199.⁴ This is typical for ports in this range — automated scanners sweep registered ports looking for open services, known vulnerabilities, or misconfigured devices. Seeing your port 3199 probed doesn't indicate it's under attack; it indicates it exists on the Internet.

How to Check What's Listening on Port 3199

If you're curious what, if anything, is bound to port 3199 on your system:

macOS / Linux:

# Show processes listening on port 3199
sudo lsof -i :3199

# Alternative using ss (Linux)
ss -tlnp | grep 3199

Windows:

# Show active connections and listening ports
netstat -ano | findstr :3199

# Then look up the PID
tasklist | findstr <PID>

If nothing is returned, nothing is listening. That's the normal state for most ports on most machines.

Why Orphaned Ports Matter

The registered ports range has tens of thousands of entries. Many are active and well-maintained. Many others are like port 3199's DMOD assignment: a product that came, registered, and went — leaving a number that now floats free, available for any software to use without official standing.

This is how the Internet works in practice. Ports are claimed, abandoned, and reused informally. The registry reflects history as much as it reflects the present. When you see a port listed as "registered," it tells you someone once cared enough to file paperwork. What they're doing with it now is another question entirely.