All ports
Port5911/SCTP
cpdlcPort
5911
Protocol
SCTP
Category
Registered
Service
cpdlc
What is port 5911?
Port 5911/SCTP is a Registered port, registered with IANA for specific applications. It is associated with the cpdlc service.
Controller Pilot Data Link Communication
Useful commands
nmapnmap -p 5911 -sV example.comnetcatnc -zv example.com 5911curlcurl -v http://example.com:5911/telnettelnet example.com 5911bash(echo > /dev/sctp/example.com/5911) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 5911/sctpDeny
sudo ufw deny 5911/sctpiptablesAllow
sudo iptables -A INPUT -p sctp --dport 5911 -j ACCEPTDeny
sudo iptables -D INPUT -p sctp --dport 5911 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=5911/sctpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 5911" dir=in action=allow protocol=SCTP localport=5911Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 5911/SCTP?
Port 5911/SCTP is associated with the cpdlc service. Controller Pilot Data Link Communication
Is it safe to expose port 5911 to the Internet?
It depends on the service and configuration. Port 5911 (cpdlc) is a Registered port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 5911 is open?
You can use nmap: `nmap -p 5911 -sV example.com`, netcat: `nc -zv example.com 5911`, or the bash command: `(echo > /dev/sctp/example.com/5911) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 5911 on my firewall?
On Linux with UFW: `sudo ufw allow 5911/sctp` (open) or `sudo ufw deny 5911/sctp` (close). With iptables: `sudo iptables -A INPUT -p sctp --dport 5911 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 5911" dir=in action=allow protocol=SCTP localport=5911`.
What applications and services use port 5911?
Port 5911/SCTP is used by the cpdlc service. Specific uses depend on the software and configuration. Check our related tools section for more information.