2 entries are registered on port 5550. 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 |
|---|---|---|---|---|---|
| :5550 | HP Data Protector | TCP | File Transfer | caution | 8.2k |
| :5550 | MERG CBUS | TCP | IoT | safe | 0 |
Hewlett-Packard Data Protector (HPDP) is a comprehensive automated backup and recovery software solution primarily used in enterprise IT environments to safeguard data across servers, applications, and storage devices. Port 5550 facilitates agent communication and management tasks, enabling streamlined backup schedules, recovery operations, and monitoring.
port 5550 as HP Data Protector →TCP port 5550 is assigned to the CBUS message protocol for model railway control.
port 5550 as MERG CBUS →The registry says what 5550 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 ':5550\b'lsof -nP -iTCP:5550 -sTCP:LISTENnetstat -ano | findstr :5550On 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 5550 — 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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