Port 2150: DYNAMIC3D — Registered, Obscure, and Mostly Quiet

What Port 2150 Is

Port 2150 sits in the registered port range (1024–49151). IANA officially assigned it to a service called DYNAMIC3D on both TCP and UDP, registered by someone named Tobias Wegner.¹

That's where the documentation ends. There's no RFC for DYNAMIC3D. No public specification. No product you can download. No company you can find. The port has a name on the IANA registry — and essentially nothing else.

This happens more often than you'd think. The registered port range exists so that applications can claim a number and avoid collisions. But claiming a port requires far less than building a widely deployed product. Many registered ports are ghosts: officially assigned, practically unused.

What Actually Uses This Port

In practice, port 2150 sees traffic from a handful of sources, none of them its registered owner.

Earth 2150 (the game): The 2000 real-time strategy game Earth 2150 uses port 2150 for multiplayer LAN sessions — a naming coincidence that's either very intentional or beautifully accidental.² If you're playing on a local network, this is the port to open.

R0xr4t trojan: Security databases flag port 2150 as a known vector for the R0xr4t trojan, a remote access tool that opens a listener on this port. If you see unexpected traffic here and you're not playing Earth 2150, that's worth investigating.³

MeetingPlace: Some sources associate port 2150 with Cisco's MeetingPlace conference bridge software, though this appears to be an unofficial or legacy use rather than an IANA registration.

How to Check What's Using This Port

On any Unix-like system:

# See what process is listening on port 2150
sudo lsof -i :2150

# Or with netstat
netstat -an | grep 2150

On Windows:

netstat -aon | findstr :2150

The process ID in the last column maps back to a running application. Cross-reference it in Task Manager or with tasklist /fi "PID eq [number]".

Why This Matters

Port 2150 is a small illustration of something true about the registered port range: registration and use are different things. IANA's registry is a coordination mechanism, not a live map of what's actually happening on your network.

The well-known ports (0–1023) are tightly controlled and well-documented. The registered range is looser — thousands of entries exist for software that never shipped, companies that no longer exist, or protocols that never gained adoption.

The dynamic/ephemeral range (49152–65535) is where operating systems assign temporary ports for outgoing connections — no registration needed or expected.

Port 2150 lives in the middle zone: officially claimed, practically unclaimed, occasionally occupied by a 25-year-old strategy game and a trojan that liked the empty real estate.