Port 3395: Unassigned — In the Registered Range, Unofficially Claimed

What Port 3395 Is

Port 3395 is a registered port — one of the 48,127 ports between 1024 and 49151. IANA maintains the registry for this range, but registration is voluntary. Port 3395 has no official IANA assignment.

The "dyna-lm" Association

Several port databases list port 3395 as associated with dyna-lm (Dyna License Manager, sometimes labeled ELAM). This appears to be connected to engineering simulation software — specifically the license management layer that controls access to finite element analysis tools used in crash simulation, structural engineering, and automotive design.

Whether this association is accurate today is unclear. It doesn't appear in the official IANA registry, and the LS-DYNA license manager (the most prominent software in this space) uses port 31010 by default. The "dyna-lm" attribution may be a legacy database entry, a historical use, or based on a specific vendor configuration.

The honest answer: if you see traffic on port 3395, it's worth checking what it is.

What "Registered but Unassigned" Actually Means

IANA maintains the port registry so that software authors can claim a port number and avoid collisions. The process is voluntary — developers can register, but most don't. The result is that "unassigned" doesn't mean "unused." It means:

• No one formally claimed this port
• Any application can use it
• You can't know what's there without checking

How to Check What's on This Port

On Linux or macOS:

# Show what's listening on port 3395
ss -tlnp | grep 3395

# Or with lsof
lsof -i :3395

On Windows:

# Show listening processes
netstat -ano | findstr :3395

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

If nothing returns, nothing is listening. If something returns, the process name tells you what claimed the port.

Why Unassigned Ports Matter

The port registry only works if people use it. When software silently grabs an unassigned port, it creates the exact collision problem the registry exists to prevent. Two applications trying to bind to the same port on the same machine creates a conflict — one wins, one fails, and the failure mode is often confusing.

Port 3395 is a small example of a larger truth: the Internet's addressing systems are conventions, not guarantees. They work because most people follow them, not because anything enforces compliance.