Cloudflare Explains How Facebook Disappeared from the Internet
(blog.cloudflare.com)
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Why would that affect facebook.co.uk running on a European datacenter too?
Facebook stopped routing the IP addresses of their own name servers, which cut them off from the internet, making all name servers globally fail to resolve all of their domains.
That doesn't make sense. Why would Facebook make facebook.co.uk connect to a US server to speak to UK residents? This happened to all Facebook sites worldwide, not just the US one. They have datacenters in other countries. There is no reason to connect to the US.
Name servers don't work that way. It doesn't matter where their primary name servers are hosted, because their records propaganda to all global name servers and you use one close to you for DNS lookups.
Facebook may or may not have name servers hosted outside the US, the only 2 IP blocks mentioned in this Cloudflare blog post are both US ones.
Regardless, they withdrew the routes for the IP blocks of the data centers where all their DNS servers are hosted, so there was no longer any primary DNS server with records for any of their domains on the internet. Once the TTL expired on the records, the name servers closest to you would have tried to query the domains and would not be able to reach any data center where a primary DNS server was hosted.