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In their defence, nobody can implement auto-detecting domains well, because there's no way to efficiently enumerate DNS records.

(Excluding NSEC-style enumeration, which is not always available.)

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I feel like I'm missing something, AXFR?

Almost no mainstream existing provider you’re migrating from would support AXFR from Bunny’s servers. But yes, AXFR would be the ideal solution in a perfect world.

iirc at least some providers let you whitelist AXFR for migrating away from them, but seems like it is usually only if you pay enough (i. e. restricted to enterprise plans).

Since it's much rarer than I thought, I guess it makes sense bunny haven't implemented support for ingesting with AXFR.

AXFR is not supported by AWS Route 53, Google Cloud DNS, Azure, Rackspace, Hetzner, Bunny, Alibaba Cloud DNS, No-IP, nor Tencent.

It is supported by Akamai Edge DNS, Oracle Cloud, enterprise Cloudflare accounts, IBM NS1 Connect, ClouDNS, CloudFloorDNS, and DNS Made Easy.

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