Port 5900
rfb · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | rfb |
| Reference | RFC 6143 |
| Registered | 2006-03 |
Frequently asked questions
What is port 5900 used for?
Port 5900 is registered with the IANA for rfb (TCP/UDP). Description: Remote Framebuffer.
Is port 5900 a well-known port?
No. Port 5900 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 5900 is open?
Locally on Linux with ss -tulpn | grep ':5900\b', on Windows with netstat -ano | findstr :5900. To test a remote host use Test-NetConnection <host> -Port 5900 in PowerShell or nc -zv <host> 5900 on Linux/macOS.
How do I open port 5900 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 5900/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5900/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5900" -Direction Inbound -Protocol TCP -LocalPort 5900 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | rfb | Remote Framebuffer |
| UDP | rfb | Remote Framebuffer |