What Port 10011 Is
Port 10011 sits in the Registered Ports range (1024-49151), which means it's technically available for IANA registration but currently has no official assignment. The port numbers in this range are nominally reserved for services that apply to IANA and get formally added to the registry—but the registry is not a gatekeeper. It's a record. What actually happens is someone runs a service on a port, the port becomes known, and the registry either documents it or doesn't.
Known Unofficial Uses
Two services are commonly observed on port 10011:
TeamSpeak 3 ServerQuery — The most documented use. TeamSpeak 3 uses this port for its ServerQuery protocol, which allows remote administration and information retrieval from TeamSpeak servers. If you encounter a TeamSpeak server, there's a good chance something is listening on 10011 on that machine. 1
Quest QoreStor — Enterprise backup and replication software uses ports 10011, 11000, and 9920 as standard Secure Connect communication ports. These are internal ports for backup infrastructure, not exposed to the public Internet in most deployments. 2
Outside of these documented uses, port 10011 is relatively quiet—which is typical for ports in the middle of the registered range.
How to Check What's Listening
To see if anything is listening on port 10011 on your machine:
On macOS or Linux:
On Windows:
From a remote machine (verify connectivity):
If nothing is listening, you'll get silence or a "connection refused" message. That's the expected state for most port numbers on most machines.
Why Unassigned Ports Matter
There are 48,128 registered ports (1024-49151). IANA has official assignments for fewer than 5,000 of them. The rest—ports like 10011—exist in a commons.
This design is intentional. The Internet doesn't require permission to exist on a port; it only requires that you document what you're doing there if you want others to find you. Port 10011 is available for anyone to use. If your application uses it, you're not breaking anything. You're participating in the normal practice of port allocation: use, documentation, coordination.
The unassigned ports are the Internet's working space—where experiments happen, where internal services run, where temporary claims are staked without ceremony. Port 10011 belongs to whichever application needs it at any given moment. That's not a bug. It's the system working as designed.
Additional references:
- SpeedGuide Port 10011 Reference
- IANA Service Name and Port Number Registry
- RFC 6335 - IANA Procedures for Port Management
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