Port 16665
axon-tunnel · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | axon-tunnel |
| Registered | 2014-09-26 |
| Modified | 2026-09-11 |
Frequently asked questions
What is port 16665 used for?
Port 16665 is registered with the IANA for axon-tunnel (TCP/UDP). Description: Reliable multipath data transport for high latencies; Reserved.
Is port 16665 a well-known port?
No. Port 16665 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 16665 is open?
Locally on Linux with ss -tulpn | grep ':16665\b', on Windows with netstat -ano | findstr :16665. To test a remote host use Test-NetConnection <host> -Port 16665 in PowerShell or nc -zv <host> 16665 on Linux/macOS.
How do I open port 16665 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 16665/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=16665/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 16665" -Direction Inbound -Protocol TCP -LocalPort 16665 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | axon-tunnel | Reliable multipath data transport for high latencies |
| UDP | – | Reserved |