Olli, > On Nov 6, 2018, at 3:23 PM, Olli Vanhoja <o...@zeit.co> wrote: > > In fact if you look at the DNS records some big Internet companies > they rarely use CNAMEs for www but instead you'll see an A record, that might > be even backed by a proprietary ANAME solution.
One detail about this is that if the CDN being used by the large Internet company is *also* providing the DNS hosting for the Internet company, then the CDN will do its resolution internally and return A / AAAA records directly. I did not do the kind of large scale measurement that Thomas Peterson did, but in anecdotally looking at the www records for a number of sites returning A/AAAA records, I often saw that the ones returning A / AAAA records also had NS records pointing to name servers run by CDNs I could recognize. (I mentioned this in a note currently as section 2.1 of https://datatracker.ietf.org/doc/draft-york-dnsop-cname-at-apex-publisher-view/ <https://datatracker.ietf.org/doc/draft-york-dnsop-cname-at-apex-publisher-view/> ) So yes, in those cases the A record is being dynamically created by whatever (potentially proprietary) ANAME/CNAME-like solution the CDN vendor is using internally in their DNS hosting operations. Dan -- Dan York Director, Content & Web Strategy, Internet Society y...@isoc.org +1-802-735-1624 Jabber: y...@jabber.isoc.org Skype: danyork http://twitter.com/danyork http://www.internetsociety.org/
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