How do I know the address of the site or service I use?

I want to use QubesOS Firewall. Only the specified addresses are allowed to connect to the Internet. The question is, how can I find out the address of the application or service I usually use (eg Thunderbird)? Please tell me how to save the connected address as a history when you start a site or application.

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it’s tricky question because some developers uses other CDNs to provide the app for you so yeah it hard to tell but i guess you can use wireshark ? (im not sure tho)