What Port 3369 Is
Port 3369 sits in the registered port range (1024-49151), the middle tier of the port numbering system. Unlike the well-known ports below 1024 — where SSH, HTTP, and DNS live — registered ports don't require elevated privileges to open. Anyone can bind to them.
IANA has assigned ports 3367-3371 to a service called satvid-datalnk, short for Satellite Video Data Link.1 The idea: a suite of ports for transmitting video over satellite links. Port 3369 is one of five in that block, registered for both TCP and UDP.
The Honest Reality
A registry entry is not the same as a living service. Satvid-datalnk has no public RFC, no widely deployed implementation anyone can point to, and no visible presence in network traffic analysis databases. The registration exists. The software, if it ever shipped, left almost no trace.
If your firewall flags port 3369, it almost certainly isn't satellite video. It's more likely:
- An application picking a port from a convenient range
- A custom internal service that happened to land here
- A port scanner probing for open doors
Checking What's Listening
If you see activity on port 3369 and want to know what's behind it:
On Linux or macOS:
On Windows:
The process ID in the output will tell you exactly which application opened the port. On Linux, cross-reference with ps aux.
Why Unassigned and Obscure Ports Matter
The registered port range exists to prevent collisions — two different applications fighting over the same port number on the same machine. But with 48,128 registered ports to fill, plenty of assignments are thin: a name, a concept, a registration that predates the Internet we actually use.
Port 3369 is one of those. It has a name. It has a block. It has almost nothing else.
That's not a problem. It means the port is available, uncrowded, and quiet — which is exactly what you want when you need a port that won't conflict with anything.
Related Ports
- 3367, 3368, 3370, 3371 — The rest of the satvid-datalnk block, equally quiet
- 3389 — RDP (Remote Desktop Protocol), the famous neighbor two dozen ports away
- 49152-65535 — Ephemeral/dynamic ports, where your OS goes when it needs a temporary outbound port
Frequently Asked Questions
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