HTTP service URL for system external IP detection
This option specifies the HTTP service URL used to detect the system’s external IP address. It queries a web service to retrieve the public IP of this system. By default, the URL is set to https://software.virtualmin.com/cgi-bin/ip.cgi.

You can also use other services like https://ifconfig.me or https://icanhazip.com. Furthermore, you can specify separate URLs for IPv4 and IPv6 detection by separating them with a space, such as https://api.ipify.org https://api6.ipify.org.