That would be zone transfer and its generally not allowed by DNS servers. And there couldn't be a single DNS server to query from, instead you would need to rec

That would be zone transfer and its generally not allowed by DNS servers. And there couldn't be a single DNS server to query from, instead you would need to recursively query all the DNS servers which also is not exactly practical. https://en.wikipedia.org/wiki/DNS_zone_transfer https://en.wikipedia.org/wiki/DNS_zone_transfer