All ports
Port11720/UDP
h323callsigaltPort
11720
Protocol
UDP
Category
Registered
Service
h323callsigalt
What is port 11720?
Port 11720/UDP is a Registered port, registered with IANA for specific applications. It is associated with the h323callsigalt service.
H.323 Call Control Signalling Alternate
Useful commands
nmapnmap -p 11720 -sV example.comnetcatnc -zv example.com 11720curlcurl -v http://example.com:11720/telnettelnet example.com 11720bash(echo > /dev/udp/example.com/11720) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 11720/udpDeny
sudo ufw deny 11720/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 11720 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 11720 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=11720/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 11720" dir=in action=allow protocol=UDP localport=11720Security 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- Outdated versions with vulnerabilities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 11720/UDP?
Port 11720/UDP is associated with the h323callsigalt service. H.323 Call Control Signalling Alternate
Is it safe to expose port 11720 to the Internet?
It depends on the service and configuration. Port 11720 (h323callsigalt) 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 11720 is open?
You can use nmap: `nmap -p 11720 -sV example.com`, netcat: `nc -zv example.com 11720`, or the bash command: `(echo > /dev/udp/example.com/11720) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 11720 on my firewall?
On Linux with UFW: `sudo ufw allow 11720/udp` (open) or `sudo ufw deny 11720/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 11720 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 11720" dir=in action=allow protocol=UDP localport=11720`.
What applications and services use port 11720?
Port 11720/UDP is used by the h323callsigalt service. Specific uses depend on the software and configuration. Check our related tools section for more information.