Port 3389 — RDP
Quick reference for TCP/UDP port 3389, used by RDP. Includes what the service does, security guidance and related ports.
What is port 3389?
Remote Desktop Protocol. High-value attacker target — restrict access.
What port does RDP use?
RDP listens on port 3389 by default.
Security guidance
High risk — do not expose to the internet
Port 3389 (RDP) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 3389 used for?+
Port 3389 is the standard TCP/UDP port for RDP. Remote Desktop Protocol. High-value attacker target — restrict access.
What port does RDP use?+
RDP listens on port 3389 by default.
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