Port 3574: DMAF — The Registered Ghost

What Port 3574 Is

Port 3574 sits in the registered port range (1024–49151). These ports aren't claimed by the operating system on startup. Instead, they're assigned by IANA to specific services upon request — software vendors, protocol designers, and developers who want a dedicated, official home for their application.

Port 3574 has two official IANA registrations, both from August 2002:¹

Both are registered to the same person: Ramakrishna Nadendla.

The Problem: DMAF Left No Traces

"DMAF" has no RFC. It has no public specification. It doesn't appear in any known open-source project, production deployment, or technical writeup. The word "Caster" suggests it may have been some kind of media streaming or broadcast system — the server/caster split mirrors patterns seen in streaming architectures — but that's speculation.

Whatever DMAF was intended to do, it never became anything anyone built or documented publicly. The registration is a name without a story.

This happens more often than you'd expect. The early 2000s saw a wave of IANA port registrations from developers building products that were ultimately never shipped, or shipped and then quietly discontinued. The registry still carries their names.

What You'd Actually Find on Port 3574 Today

If you saw traffic on port 3574 in the wild, it almost certainly wouldn't be DMAF. Undeployed registered protocols leave their port numbers functionally available for any software that happens to choose them. In practice, a port is only meaningful when something is listening on it.

How to Check What's Listening

On macOS or Linux:

# Show what's listening on port 3574
lsof -i :3574

# Or with ss (Linux):
ss -tlnp | grep 3574

On Windows:

netstat -ano | findstr :3574

If nothing is listening, the port is simply unused. That's the most likely result.

Why This Matters

The registered port range has 48,128 possible values. Many of them look like port 3574 — officially claimed, functionally empty, carrying a name that's outlived the project that requested it.

This is actually healthy. A port registered to a dormant protocol is better than a port squatted by malware. IANA's registry, even when it points to forgotten projects, provides a paper trail. If traffic does appear on port 3574, the registry at least gives you a starting point: something named DMAF, registered in 2002, that never went anywhere you can find.