2 entries are registered on port 2001. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.
services registered on this number
1 transport in use
entries encrypted on the wire
1 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :2001 | CAPTAN Test Stand | UDP | System | caution | 11.8k |
| :2001 | wizard | UDP | — | safe | 0 |
CAPTAN Test Stand System is primarily utilized in experimental physics and engineering setups to manage communication between data acquisition hardware and control systems. Operating over UDP, it facilitates the transfer of commands and data in real-time environments, particularly in test stands for particle detectors and sensor arrays.
port 2001 as CAPTAN Test Stand →UDP port 2001 is registered as the wizard service, with IANA's description “curry.”.
port 2001 as wizard →The registry says what 2001 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.
ss -ltnp | grep ':2001\b'lsof -nP -iTCP:2001 -sTCP:LISTENnetstat -ano | findstr :2001On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.
A port number is not a service. Anything may listen on 2001 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
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