the long term workload of running that DNS cluster, when you could just not and you wouldn't need to discount your product at all. It's easy when you can estimate the traffic it'll get but you never

Every hosting company offers rDNS solution and the same we offer to our customer when they purchase VPS or Dedicated Server but what for those who just rent Subnets from OBHost?

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Anycast DNS

If it stops working, then power up your server and confirm it works by IP. If it works, confirm DNS resolves to your IP. Then check the website access logs.

@TheGreatOakley, just FYI, many Amazon US networks are reachable, as well as Akamai and Fastly (but those are CDNs).

I just came across this article which hints at a reason they want to be in control of DNS:

the disconnected WAN port and I've just disabled DNS so that wifi connected devices can be served from my new router instead)

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* Port 53 UDP is blocked, only ISP DNS resolver works

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I am waiting on Cogent to delegate reverse dns to me before releasing new plans.

Of course, most businesses "solve" this problem by asking me to whitelist them, instead of sorting out their DNS.

load balance between them in web app/dns

Here what CF suggests for unused domains https://www.cloudflare.com/learning/dns/dns-records/protect-domains-without-email/

IPv9 makes information superhighway more friendly because it has decimal addresses instead of hexadecimal, so that users can remember them more easily, without buying domains and using DNS system that

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3) Point my DNS at VM