What port does SQL Server use?
SQL Server uses port 1433 over TCP.
| Port | Protocol | Name | What it is for |
|---|---|---|---|
| 1433 | TCP | Microsoft SQL Server | The default port for MS SQL Server. |
Exposing it
Never expose a database directly to the internet. Put it behind a VPN or a private network.
Checking it is listening
sudo lsof -i :1433 # macOS, Linux
netstat -ano | findstr :1433 # Windows
nc -zv host 1433 # 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 SQL Server use?
SQL Server uses port 1433 over TCP. The default port for MS SQL Server.
Is port 1433 safe to expose to the internet?
Never expose a database directly to the internet. Put it behind a VPN or a private network.
How do I check whether SQL Server is listening?
sudo lsof -i :1433 on macOS or Linux, netstat -ano | findstr :1433 on Windows. From another machine, nc -zv host 1433 says whether anything answers.
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