Port 531
conference · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | conference |
Frequently asked questions
What is port 531 used for?
Port 531 is registered with the IANA for conference (TCP/UDP). Description: chat.
Is port 531 a well-known port?
Yes. Port 531 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 531 is open?
Locally on Linux with ss -tulpn | grep ':531\b', on Windows with netstat -ano | findstr :531. To test a remote host use Test-NetConnection <host> -Port 531 in PowerShell or nc -zv <host> 531 on Linux/macOS.
How do I open port 531 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 531/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=531/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 531" -Direction Inbound -Protocol TCP -LocalPort 531 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | conference | chat |
| UDP | conference | chat |