Comment by x13

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.