> even if it's only been standardised in 2016, it's been a de-factor standard for quite a while, especially in the internet-technology-years.
If archive.is thinks that Internet standards should be adopted so quickly, it's weird that they don't support IPv6 considering it's been a standard since 1998!
Obviously I'm kidding, but only kind of. When it comes to insisting on adopting new standards, edns-client-subnet is a weird hill to die on, especially considering it was always meant to be optional.
> does Cloudflare the CDN simply disregard ECS when receiving requests from DNS.Google, or do they take it into account?
I don't think they have a reason to use it because they use TCP anycast. Looking at https://cachecheck.opendns.com/ they seem to return the same IPs regardless of geography.