Back in 2015 we deployed ECMP routing - Equal Cost Multi Path - within our datacenters. This technology allowed us to spread traffic heading to a single IP address across multiple physical servers.
Since March 30, 2017, Cloudflare has been providing DNS Anycast service as additional F-Root instances under contract with ISC (the F-Root operator). F-Root is a single IPv4 address plus a single IPv6 address which both ISC and Cloudflare announce to the global Internet as a shared Anycast. This document reviews
I wrote a blog post the other day about CloudFlare's globally distributed DNS infrastructure and how each ninja name server we give you when you signup doesn't represent just one machine, but instead a whole cluster of machines in each of the data centers we operate worldwide.