Port 9131

dddp · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicedddp
Registered2005-08

Frequently asked questions

What is port 9131 used for?

Port 9131 is registered with the IANA for dddp (TCP/UDP). Description: Dynamic Device Discovery.

Is port 9131 a well-known port?

No. Port 9131 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 9131 is open?

Locally on Linux with ss -tulpn | grep ':9131\b', on Windows with netstat -ano | findstr :9131. To test a remote host use Test-NetConnection <host> -Port 9131 in PowerShell or nc -zv <host> 9131 on Linux/macOS.

How do I open port 9131 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 9131/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=9131/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 9131" -Direction Inbound -Protocol TCP -LocalPort 9131 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPdddpDynamic Device Discovery
UDPdddpDynamic Device Discovery

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