What name servers does Let's Encrypt use?

Issuance Policy
1

Hi,
I don’t want to request for a new SSL certificate if I have just changed my domain DNS and the changes are not yet reflected in let’s encrypt name server. I think if LE name servers are not kept private, I should resolve my domain with them beforehand.
What name servers does Let’s Encrypt use?

2

None, the server always does its own authoritative lookups to minimise propagation time and risk of cache poisoning attacks.

3

Doesn’t matter. Just try it. If the authorization fails, no certificate will be issued, so there shouldn’t be a problem with any rate limits.

4

thanks cool110 and kelunik,
one more question, how many authoritative does let’s encrypt use to verify the domain?

5

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