Port 5911
ats-acars and cpdlc · SCTP/TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | SCTP/TCP/UDP |
| Service | ats-acars and cpdlc |
| Registered | 2008-10-10 |
| Modified | 2022-08-08 |
Frequently asked questions
What is port 5911 used for?
Port 5911 is registered with the IANA for ats-acars and cpdlc (SCTP/TCP/UDP). Description: Air Traffic Services applications using ACARS; Controller Pilot Data Link Communication.
Is port 5911 a well-known port?
No. Port 5911 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 5911 is open?
Locally on Linux with ss -tulpn | grep ':5911\b', on Windows with netstat -ano | findstr :5911. To test a remote host use Test-NetConnection <host> -Port 5911 in PowerShell or nc -zv <host> 5911 on Linux/macOS.
How do I open port 5911 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 5911/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5911/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5911" -Direction Inbound -Protocol TCP -LocalPort 5911 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ats-acars | Air Traffic Services applications using ACARS |
| UDP | ats-acars | Air Traffic Services applications using ACARS |
| SCTP | cpdlc | Controller Pilot Data Link Communication |