[paulddraper]

Windows Firewall can allow or block domains.

It doesn't have "allow but notify," if that's what you're looking for.

[unsnap_biceps]

Thanks, I'll look more into this.

With little snitch, I use "notify and I select allow or deny". And it works for ip addresses (4 and 6) as well as domains. It's a powerful system, but if I can get similar with domain allowlisting, that would be a worthwhile improvement.

[sweetbacon]

I've never used little snitch but I'm betting Simplewall is what you probably want on Windows.