Port 9986

kaostransport · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicekaostransport
Registered2025-10-30
Modified2026-11-04

Frequently asked questions

What is port 9986 used for?

Port 9986 is registered with the IANA for kaostransport (TCP/UDP). Description: KAOS secure message transport protocol for safety-critical environments; Reserved.

Is port 9986 a well-known port?

No. Port 9986 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 9986 is open?

Locally on Linux with ss -tulpn | grep ':9986\b', on Windows with netstat -ano | findstr :9986. To test a remote host use Test-NetConnection <host> -Port 9986 in PowerShell or nc -zv <host> 9986 on Linux/macOS.

How do I open port 9986 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 9986/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=9986/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 9986" -Direction Inbound -Protocol TCP -LocalPort 9986 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPkaostransportKAOS secure message transport protocol for safety-critical environments
UDP–Reserved

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