2 entries are registered on port 1550. 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 |
|---|---|---|---|---|---|
| :1550 | Gadu-Gadu C2C | Network Services | caution | 7.7k | |
| :1550 | 3M Image Storage License Manager | TCPUDP | — | safe | 0 |
Port 1550 is used for Gadu-Gadu's direct client-to-client (C2C) connections, facilitating peer-to-peer communication within this popular Polish instant messaging service. This port assists clients in bypassing centralized servers to establish direct connections for file transfers or conversations.
port 1550 as Gadu-Gadu C2C →Port assigned to the 3M Image Storage license manager over TCP and UDP.
port 1550 as 3M Image Storage License Manager →The registry says what 1550 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 ':1550\b'lsof -nP -iTCP:1550 -sTCP:LISTENnetstat -ano | findstr :1550On 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 1550 — 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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