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domain name system - Who has traffic data in the Registrar-DNS-Host chain

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When you register a domain, typically
the registrar will set it up on their default DNS servers and point it to their default
web server to serve their default parked
page.




Obviously the web server (or
hosting company) serving out the pages will always know traffic, so in the
Registrar-DNS-Host chain, I'm really asking about the first 2: registrar and DNS
provider.



If you edit the zone file with the
registrar to point to your own web server, the website is no longer hosted with the
registrar, but the registrar still hosts the DNS. Would hosting DNS still enable them to
count traffic?



If you change nameservers and
point it to a specialist provider like DNS Made Easy, then the registrar has nothing
left (except basic registrar functionality, like WHOIS, etc.) So I'm guessing at this
point, they have no way of estimating traffic at all. Is this
correct?



I'm basically trying to verify my guess
that only the Host or DNS provider can count traffic, but the registrar itself has no
way of doing that.


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class="normal">Answer



Does a
registrar still see DNS traffic if you host a domain on your own
nameservers?




Maybe. In order to
locate your nameservers, recursive DNS servers have to trace authority from your domain
starting from the root nameservers. If the registrar also owns the top-level nameservers
involved, DNS traffic is still traversing their
nameservers.



Can the registrar measure traffic
for your domain?



Not
effectively.



All that the registrars and
authoritative nameservers see are DNS lookups made by caching servers on
behalf of clients. The caching DNS servers mask the number of clients
requesting data from your domain, as they are not going to ask for data on behalf of a
customer unless it has fallen out of cache (TTL
expiry).



At best, they can measure
popularity of your website (very coarsely) by how frequently your
records are falling out of cache, but there's no way they can measure something like
"clicks per second".


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