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Port 3389: Remote Desktop (RDP)

Common Ports Reference: What runs on port 3389, 445 or 5985: common TCP and UDP ports for web, mail, Windows, AD, databases and VPNs, with security notes.

The ports that come up when opening a firewall, reading a scan or troubleshooting a connection: what runs on each, TCP or UDP, and what to watch out for. Search by number or name. Port numbers and service names were checked against IANA's port number registry; ports that are widely used but assigned by IANA to something else are marked unofficial.

Port number or name

3389 is a registered port (1024-49151): assigned by IANA on request. IANA's registry lists everything assigned to it: look up 3389 at IANA.

1 of 96 ports

PortProtocolServiceWhat it's forIANA name
3389
TCP, UDP
Remote Desktop (RDP)
Windows Remote Desktop; UDP 3389 improves performance over poor links.
ms-wbt-server
Careful: Never open this to the internet; reach it over a VPN or from trusted networks only. Exposed RDP is one of the most common ways ransomware gets in; use a VPN or a Remote Desktop Gateway on 443.

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