What port does Oracle use?
Oracle uses port 1521 over TCP.
| Port | Protocol | Name | What it is for |
|---|---|---|---|
| 1521 | TCP | Oracle Database | Oracle listener port. |
What catches people out
Same rule — databases belong on a private network.
Checking it is listening
sudo lsof -i :1521 # macOS, Linux
netstat -ano | findstr :1521 # Windows
nc -zv host 1521 # from elsewhereAn "address already in use" error on a port nothing appears to be holding usually means the socket is in TIME_WAIT rather than that a process has it — the ports reference covers that and the ephemeral range.
Frequently asked questions
What port does Oracle use?
Oracle uses port 1521 over TCP. Oracle listener port.
What should I watch out for with port 1521?
Same rule — databases belong on a private network.
How do I check whether Oracle is listening?
sudo lsof -i :1521 on macOS or Linux, netstat -ano | findstr :1521 on Windows. From another machine, nc -zv host 1521 says whether anything answers.
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