What port does RDP use?
RDP uses port 3389 over TCP.
| Port | Protocol | Name | What it is for |
|---|---|---|---|
| 3389 | TCP | RDP | Windows Remote Desktop. |
Exposing it
A primary ransomware entry vector. Put it behind a VPN, require network level authentication, and never expose it directly.
Checking it is listening
sudo lsof -i :3389 # macOS, Linux
netstat -ano | findstr :3389 # Windows
nc -zv host 3389 # 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 RDP use?
RDP uses port 3389 over TCP. Windows Remote Desktop.
Is port 3389 safe to expose to the internet?
A primary ransomware entry vector. Put it behind a VPN, require network level authentication, and never expose it directly.
How do I check whether RDP is listening?
sudo lsof -i :3389 on macOS or Linux, netstat -ano | findstr :3389 on Windows. From another machine, nc -zv host 3389 says whether anything answers.
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