Port 9900

iua · SCTP/TCP/UDP

RangeRegistered port (1024–49151)
ProtocolSCTP/TCP/UDP
Serviceiua

Frequently asked questions

What is port 9900 used for?

Port 9900 is registered with the IANA for iua (SCTP/TCP/UDP). Description: IUA.

Is port 9900 a well-known port?

No. Port 9900 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 9900 is open?

Locally on Linux with ss -tulpn | grep ':9900\b', on Windows with netstat -ano | findstr :9900. To test a remote host use Test-NetConnection <host> -Port 9900 in PowerShell or nc -zv <host> 9900 on Linux/macOS.

How do I open port 9900 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 9900/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=9900/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 9900" -Direction Inbound -Protocol TCP -LocalPort 9900 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPiuaIUA
UDPiuaIUA
SCTPiuaIUA

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