Port 5900 — VNC
Quick reference for TCP/UDP port 5900, used by VNC. Includes what the service does, security guidance and related ports.
What is port 5900?
Virtual Network Computing remote desktop.
What port does VNC use?
VNC listens on port 5900 by default.
Security guidance
High risk — do not expose to the internet
Port 5900 (VNC) 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 5900 used for?+
Port 5900 is the standard TCP/UDP port for VNC. Virtual Network Computing remote desktop.
What port does VNC use?+
VNC listens on port 5900 by default.
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