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What's at the Other End of 8.8.8.8?
8.8.8.8 is Google’s “free, global DNS resolution service”, so popular that it’s been lampooned by XKCD. It has a wonderfully straightforward front-end: the IP address 8.8.8.8. But that begs the question: what’s on the back-end? Do the authoritative nameservers receive queries from 8.8.8.8 or some other IP address? Spoiler: the queries don’t originate from 8.8.8.8; instead, the queries originate from a range of IP addresses, some IPv4, some IPv6. Testing 8.8.8.8 To see how 8.8.8.8 queries authoritative nameservers, I need an authoritative nameserver. Luckily, I happen to be in possession of such a nameserver (well, four such nameservers).
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