No Windows doesn't have any fallback DNS servers configured. It will use the ones provided by DHCP or the ones you configure manually. I don't know about the n

No Windows doesn't have any fallback DNS servers configured. It will use the ones provided by DHCP or the ones you configure manually. I don't know about the newest version of macOS but iOS and the versions of macOS I used didn't have any fallback DNS servers. I wouldn't want a feature like that enabled by default. It can be useful if I have the option to configure it but enabled by default populated with DNS servers chosen by whoever submitted the pull request? No thanks.