Google no longer returning AAAA records?

Phil Mayers p.mayers at
Thu Apr 16 12:41:30 CEST 2015

On 16/04/15 01:57, Lorenzo Colitti wrote:

> For the avoidance of mystery: Google performs measurements of IPv6
> connectivity and latency on an ongoing basis. The Google DNS servers do
> not return AAAA records to DNS resolvers if our measurements indicate
> that for users of those resolvers, HTTP/HTTPS access to dual-stack
> Google services is substantially worse than to equivalent IPv4-only
> services. "Worse" covers both reliability (e.g., failure to load a URL)
> and latency (e.g., IPv6 is 100ms worse than IPv4 because it goes over an
> ocean). The resolvers must also have a minimum query volume, which is
> fairly low.


Thanks for the response.

Do you know if Google have given any thought as to how long they might 
find it necessary to take these measures? Years, indefinitely?

Just curious.

More information about the ipv6-ops mailing list