Port 2062 sits in the registered port range (1024–49151) with an official IANA entry and a name, "ICG SWP," that no one seems able to explain. The registration exists. The acronym does not resolve into anything documented.
What "Registered" Actually Means
The registered port range exists so that software vendors and protocol designers can claim a number and avoid collisions. To register a port, you submit a request to IANA with a service name and description. IANA records it. The Internet moves on.
Port 2062's registration is real. But a registration without documentation is a placeholder, not a protocol. "ICG SWP" appears in port databases worldwide, copied from the IANA registry, with no further explanation downstream.1
What Actually Runs Here
The most commonly observed use of port 2062 is Skype's peer-to-peer traffic. Skype's original architecture was famously aggressive about port selection — it would try its preferred ports first, then fall back to whatever was available, including registered ports in the 2000s range. Port 2062 shows up in older Skype traffic analysis for this reason.2
Beyond Skype, if you see port 2062 active on a machine, it's almost certainly an application that picked it dynamically rather than anything intentionally running "ICG SWP." The number is the clue, not the answer.
How to Check What's Listening
If you see port 2062 in a firewall log or network scan and need to know what's actually there:
On Linux or macOS:
On Windows:
The process ID in the output tells you the application. That's the real answer — the port number is just where it parked.
Why Unassigned-in-Practice Ports Matter
A port can be registered without being used. It can be used without being registered. The gap between the two is where most real-world traffic actually lives.
Port 2062 is a reminder that the registry is a map, not the territory. Thousands of registered ports have names attached to forgotten proposals, defunct companies, or protocols that never shipped. They're not dangerous — they're just ghosts of intentions that never became implementations.
When you encounter one, the right move is to look at the process, not the port number.
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