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Most NAT providers don't like seeing the IPs posted in public. I guess thats the reason the don't use/post DNS.

I don't mean RDNS. I mean for example, if the IP of the shared IPv4 address is 123.45.67.8, the domain shared.hosting-company-name.com could resolve to this IP. The clients could then always use the d

It's not common i'd say but does happen. Can't remember seeing any openly announced DNS. But i remember at least Virtvire having setup reverse DNS on the NAT IPs. Never tried if they resolved the othe

DNS usually isn't set, and there's no guarantee of rDNS since hosts don't tend to like people to do naughty things from the shared IP.

If so, do providers have some DNS for that shared IP setup so you can always reach your server via a certain domain?

Apparently A2Hosting has one, priced at $3 or so. But I'm not convinced anyone can offer this at that price point. Has anyone tried this? Or is this a scam? https://www.a2hosting.com/anycast-dns-hosti

(all machines are in a similar domain in the DNS)

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* Reverse DNS tests

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Generally, I would discourage from using registrar's DNS, seen some shady practises were observed in past. For example, injecting redirects for non-existing subdomains and such (yes, I'm looking at yo

Yes exactly but it can also be frustrating. You may not want to wait hours or even days before updating your DNS records because you have to wait for the ttl records to expire

As for increased ttl, isn't that meant to help your site's availability in case DNS goes down?

I setup 1 minute monitoring on name silo dns after reading their disclaimer about increasing default ttl after 2 weeks of no changes to improve caching by 3rd party dns... I was not impressed.. Seriou

Ok, I signed up for cloudflare to try that out. I also have an account at freedns.afraid.org that I haven't used.

DNS not so much, there is not much ground where either of these two could hold you as a hostage.

As a personal opinion NAMESILO is the best domain sales provider, you know how much it costs to buy and renew, in addition to an excellent DNS handling.

Diversify! Use different companies for registrar, hosting and DNS. That way they can't hold you hostage, you can always move without them needing to cooperate with you.