Our latest updates, which have been rolled out to all regions over the past few days, enable better geographic relevance of DNS responses for domains that use GeoDNS to direct users to their closest service point.
A few weeks ago we updated our back-end resolver service to use the EDNS Client Subnet feature of the DNS protocol. This enables authoritative domain servers using GeoDNS to tailor their IP address responses to the location of your network, instead of relying on the location of our DNS Protection data center. Since then we have been gradually increasing the proportion of traffic that is being handled by the new resolver service until, now, all traffic is being handled in this way.
For GeoDNS domains that support EDNS Client Subnet, this means that your users should be pointed to the most appropriate service location.
EDNS Client Subnet works by forwarding information about the IP subnet that your queries originate from. We don't send the full IP address - just enough to allow an upstream DNS server to know where you are in the world. Of course, it's up to the owners of the domains how they use that information, according to how they have distributed their services around the world. But for many major web services this will help ensure users get the best possible experience.