Port
Port 3389 — RDP
Port 3389 (TCP) is used by RDP. Remote Desktop Protocol — Windows graphical remote access.
Port 3389 at a glance
| Property | Value |
|---|---|
| Port number | 3389 |
| Transport | TCP |
| Service | RDP |
| Category | Registered port |
What it is used for
Remote Desktop Protocol — Windows graphical remote access.
Security considerations
A top ransomware entry point. Never expose to the internet; use a VPN + MFA.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 3389 used for?
Port 3389 (TCP) is used by RDP. Remote Desktop Protocol — Windows graphical remote access.
Is port 3389 TCP or UDP?
Port 3389 uses TCP.
Is it safe to open port 3389?
A top ransomware entry point. Never expose to the internet; use a VPN + MFA.
Related
Learn networking hands-on
Master IP addressing, subnetting and Cisco configuration on real lab devices with placement support at Attila Technologies, Ahmedabad.