The launch of Cloudflare's new 126.96.36.199 DNS service has brought much fanfare and a heap of praise. More choice is always a good thing, and support for both DNS-over-TLS and DNS-over-HTTPS make 188.8.131.52 an interesting option. In this post I'm going to explain why I won't use it yet, and why you might not want to switch either without doing some testing first.
Fastest isn't always best
Cloudflare touts 184.108.40.206 as "the Internet's fastest DNS directory." In terms of pure response time, they might be right. But when dealing with DNS, response time is only part of the equation. Just as important are the replies you get from a DNS server, the IP addresses it hands out in response to domain queries. Responses from centralized DNS services are sometimes unsatisfactory and can lead to service degradation. The answers come fast, but are they the right ones?
I like to use a telephone analogy here. Imagine you dial 9-1-1 and your call is answered so quickly you ne...