What Port 10345 Is
Port 10345 is unassigned. There is no official service registered with IANA for this port number. It has no RFC defining it, no protocol bound to it, no canonical use case.
The Port Range (1024-49151): Registered Ports
Port 10345 falls in the Registered Ports range, defined by IANA in RFC 6335.1 This range (1024-49151) is where applications and services request permanent port assignments. Any organization can petition IANA to register a port number here for their service.2
But here's the thing: even though this is the "assigned" range, the vast majority of ports in it remain unassigned. At the time RFC 6335 was written, only about 9% of the Registered Ports had been claimed.3 Port 10345 is part of that silent 91%.
No Known Uses
Web searches return nothing specific for port 10345. No malware associated with it. No exploits. No legitimate services known to default to this port. It's simply not in use in any documented way.
This is actually the normal state for most ports. The port space is large. It has to be. If every port were assigned, there would be nowhere left to put new services.
How to Check What's Using This Port
If you see port 10345 open on your system, here's how to find what's listening:
On macOS/Linux:
On Windows:
These commands will show you the process using the port, the protocol (TCP/UDP), and the state of the connection. If nothing is listening, the port is simply available for use.
Why Unassigned Ports Matter
The Internet doesn't work because every door has a label. It works because there are many unlabeled doors.
An unassigned port is freedom. It's why applications can spawn temporary listening ports. It's why developers can experiment. It's why the Internet can adapt.
Port 10345 is one of thousands of unassigned Registered Ports. None of them are problematic. They're infrastructure: the unused space that makes the used space possible.
If you need a port number for an internal service, you can use any unassigned port in this range. If you want to register a new service with IANA and claim a port permanently, you can petition IANA through their application process.2
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