2 entries are registered on port 861. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.
services registered on this number
2 transports in use
entries encrypted on the wire
2 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :861 | One-Way Active Measurement Protocol (OWAMP) Control | TCP | Network Services | safe | 0 |
| :861 | OWAMP-Test | UDP | Network Services | safe | 0 |
Control channel for OWAMP network measurements, coordinating one-way delay and packet-loss test sessions.
port 861 as One-Way Active Measurement Protocol (OWAMP) Control →UDP endpoint for OWAMP one-way active network performance measurements.
port 861 as OWAMP-Test →The registry says what 861 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 ':861\b'lsof -nP -iTCP:861 -sTCP:LISTENnetstat -ano | findstr :861On 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 861 — 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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