2 entries are registered on port 5421. 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
2 transports in use
entries encrypted on the wire
2 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :5421 | NetSupport Manager | TCPUDP | Security | caution | 7.7k |
| :5421 | Net Support 2 | TCPUDP | — | safe | 0 |
NetSupport Manager is a remote control software solution widely used by enterprises and educational institutions for remote desktop management, classroom control, and IT support. It enables administrators and teachers to connect to and control multiple endpoints seamlessly over a network, providing a versatile toolset for system management, troubleshooting, and collaboration.
port 5421 as NetSupport Manager →Port 5421 is assigned to Net Support 2, a service registered by Paul Sanders.
port 5421 as Net Support 2 →The registry says what 5421 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 ':5421\b'lsof -nP -iTCP:5421 -sTCP:LISTENnetstat -ano | findstr :5421On 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 5421 — 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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