namecheap has a free dns service, maybe nsone or google cloud ns (free credit for a year)

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Check cloudns.net

Good luck with your DNS. If you've EVER dealt with bind, nsd will be a walk in the park.

I remembered CF also provide DNSSEC , what exactly does it mean by "privacy-oriented host" ?

Never dealt with them. Having DNSSEC is a good idea, since the entire protocol is really broken. Setup your own slaves if possible- because you're going to want SOME backup.

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Yeah i have four VPS but sadly only one has an actual IPv4 where i can bind a DNS service.

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You mean installing the software and setting my own dns server up?

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https://dns.he.net/ works for me

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I use cf dnsonly - https://www.cloudflare.com/dns/dns-firewall/ for some stuff. There is no web involved.

Is it possible to use CloudFlare without having any traffic (except DNS) routed through their network? (aka, acting only as a DNS)

I use CloudFlare to manage DNS on all of my domains, never had any issues with it.

What's wrong with a CloudFlare DNS? I've had 100% uptime on their nameservers since I started with them.

So far i tried FreeDNS by he.net but apparently i can't add my personal domain for "abuse" reasons, freedns.afraid.org has a minimum of 1 hour as TTL (not properly suited for my home

On the host server, an attempt to ping global IPv6 addresses should now work (assuming DNS works).