How would you update that database? Who would you ask for the updates? IPs change out from under domains constantly. How would knowledge of those changes make

How would you update that database? Who would you ask for the updates? IPs change out from under domains constantly. How would knowledge of those changes make their way from the owner of the domain to your local database? If you'd want a single source of truth to receive and distribute that info, that's a single point of failure and comes with lots of technical challenges. And it's less "you could never get this 1%" and more "you will never need 99.9% of this" ------------------------------------------------ However, that's all entirely unrelated to this Cloudflare incident, which involved no domains at all, only raw IP addresses. This was an incident involving BGP, which is how the various providers of internet backbone know which other provider they connect to is able to answer requests made to a given IP address, and how changes to that information propagate.