2 entries are registered on port 1001. 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
1 transport in use
entries encrypted on the wire
1 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :1001 | JtoMB Protocol | TCP | Network Services | caution | 11.0k |
| :1001 | Web Push | TCPtls | Web Services | safe | 0 |
JtoMB is an unofficial, lesser-known protocol operating over TCP port 1001, occasionally used in embedded systems, IoT devices, or proprietary middleware solutions. Its primary purpose often revolves around message brokering or device communication in specialized environments rather than widespread internet services.
port 1001 as JtoMB Protocol →HTTP Web Push traffic between applications, push services, and web browsers.
port 1001 as Web Push →The registry says what 1001 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 ':1001\b'lsof -nP -iTCP:1001 -sTCP:LISTENnetstat -ano | findstr :1001On 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 1001 — 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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