I was wondering which NS server is used by Let’s Encrypt to validate the DNS challenge. I found several similar answers on the forum after some googling: DNS Servers used by LetsEncrypt for Challenges Which DNS server Letsencrypt use to verify the dns-01 challenge? TTL and DNS server used by Lets…

Clearly specify which NS server is used for DNS challenge validation

JuergenAuer May 11, 2020, 5:44pm 5

Additional:

These are Unbound instances. And it's official documented.

The Unbound instances use the same configuration like

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