What port does PostgreSQL use?
PostgreSQL uses port 5432 over TCP.
| Port | Protocol | Name | What it is for |
|---|---|---|---|
| 5432 | TCP | PostgreSQL | The default PostgreSQL port. |
Exposing it
Keep it on a private network. Configure `pg_hba.conf` deliberately — a permissive `host all all 0.0.0.0/0 md5` line is a common and serious mistake.
Checking it is listening
sudo lsof -i :5432 # macOS, Linux
netstat -ano | findstr :5432 # Windows
nc -zv host 5432 # 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 PostgreSQL use?
PostgreSQL uses port 5432 over TCP. The default PostgreSQL port.
Is port 5432 safe to expose to the internet?
Keep it on a private network. Configure `pg_hba.conf` deliberately — a permissive `host all all 0.0.0.0/0 md5` line is a common and serious mistake.
How do I check whether PostgreSQL is listening?
sudo lsof -i :5432 on macOS or Linux, netstat -ano | findstr :5432 on Windows. From another machine, nc -zv host 5432 says whether anything answers.
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