Google no longer returning AAAA records?

Erik Kline ek at
Fri Apr 17 05:17:12 CEST 2015

On Thu, Apr 16, 2015 at 7:41 PM, Phil Mayers <p.mayers at> wrote:
> 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.
> Lorenzo,
> 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.

It seems to keep on finding things, so...

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