What Range This Port Belongs To
Port 2011 is a registered port — part of the range from 1024 to 49151. IANA manages this range. Anyone with a legitimate service can apply to have a port number reserved for it, and IANA adds the name to the official registry.
The well-known ports (0-1023) are different: those are tightly controlled and reserved for foundational protocols like HTTP (80), HTTPS (443), and SSH (22). Registered ports are more like a land registry — you stake a claim, IANA records it, and the name is yours. Nobody checks whether you're actually building anything.
What IANA Says About Port 2011
The IANA registry lists port 2011/TCP with the service name raid-cc. Port 2011/UDP shows servserv in some secondary databases.
What is raid-cc? That's where the trail goes cold. There's no RFC for it. No official documentation. No known software that implements it. No forum threads from network engineers wondering why it's open. The name exists in the registry. The service, by all available evidence, never went anywhere — or was registered and quietly abandoned before it shipped.
This is more common than it sounds. The registered port range contains thousands of entries from companies and projects that filed paperwork decades ago and then changed direction, got acquired, shut down, or simply never launched. The registry preserves the name. The Internet doesn't notice.
Security Considerations
An unrecognized service running on port 2011 deserves attention precisely because there's no legitimate well-known service to explain it. Malware, backdoors, and custom remote-access tools all tend to use ports that don't draw immediate scrutiny — and an obscure registered port with no known legitimate use is exactly the kind of port that might go unquestioned.
If you see traffic on port 2011, find out what's generating it before assuming it's benign.
How to Check What's Listening on Port 2011
On Linux/macOS:
On Windows:
Then take the PID from that output and look it up:
If something is listening on port 2011 and you don't recognize the process, that's worth investigating.
Why Unassigned (and Ghost-Assigned) Ports Matter
The 65,535 available port numbers are not infinitely renewable. They're a finite address space. IANA's registry exists so that two different services don't accidentally collide — so that when your machine opens port 2049, both sides can agree it's NFS and not something else.
But the registry is only as useful as the services behind it. A port registered to a service that no longer exists occupies a slot, creates the appearance of legitimacy, and confuses anyone who looks it up. Port 2011 isn't dangerous by itself. It's a reminder that the registry is a record of intentions, not a map of reality.
Frequently Asked Questions
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