2 entries are registered on port 6503. 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
1 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :6503 | Netop School | UDP | Remote Access | caution | 4.7k |
| :6503 | BoKS Clntd | TCPUDP | System | safe | 0 |
Netop School is an educational software solution developed by Netop Business Solutions designed to facilitate classroom management and interactive teaching. It allows teachers to monitor, control, and communicate with student devices to enhance the learning experience. The service uses UDP port 6503 for communication between the instructor’s and students’ systems.
port 6503 as Netop School →BoKS Clntd is the IANA-assigned client-daemon service name for TCP and UDP port 6503.
port 6503 as BoKS Clntd →The registry says what 6503 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 ':6503\b'lsof -nP -iTCP:6503 -sTCP:LISTENnetstat -ano | findstr :6503On 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 6503 — 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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