2 entries are registered on port 1533. 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 |
|---|---|---|---|---|---|
| :1533 | IBM Sametime & SQL Server | TCP | Network Services | safe | 13.5k |
| :1533 | Virtual Places Software | TCPUDP | Voice and Chat | safe | 0 |
Port 1533 is primarily known for IBM Sametime, which is an enterprise instant messaging and collaboration platform, as well as some communication with Microsoft SQL Server components. It facilitates virtual meetings, rich media chat, and integration with various enterprise tools that support real-time messaging and presence information.
port 1533 as IBM Sametime & SQL Server →Port 1533 is assigned to Virtual Places Software, a legacy virtual-places service.
port 1533 as Virtual Places Software →The registry says what 1533 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 ':1533\b'lsof -nP -iTCP:1533 -sTCP:LISTENnetstat -ano | findstr :1533On 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 1533 — 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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