Port 33331

diamondport · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicediamondport
Registered2002-07

Frequently asked questions

What is port 33331 used for?

Port 33331 is registered with the IANA for diamondport (TCP/UDP). Description: DiamondCentral Interface.

Is port 33331 a well-known port?

No. Port 33331 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 33331 is open?

Locally on Linux with ss -tulpn | grep ':33331\b', on Windows with netstat -ano | findstr :33331. To test a remote host use Test-NetConnection <host> -Port 33331 in PowerShell or nc -zv <host> 33331 on Linux/macOS.

How do I open port 33331 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 33331/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=33331/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 33331" -Direction Inbound -Protocol TCP -LocalPort 33331 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPdiamondportDiamondCentral Interface
UDPdiamondportDiamondCentral Interface

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