we cannot call every single internet provider around the world and ask them to drop DNS record from cache Google allows users to flush a record from their cach

we cannot call every single internet provider around the world and ask them to drop DNS record from cache Google allows users to flush a record from their cache https://developers.google.com/speed/public-dns/cache https://developers.google.com/speed/public-dns/cache which is better than nothing, especially if you use Google's resolvers on your servers.