Let's encrypt - IP-Adresses

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Hello,
I am using Plesk and would like to use Let's Encrypt.
Actually I have blocked IPs from other continents than Europe, as we had massive attacks from Russia and USA.
From which IPS does Let's Encrypt connect, so that I can whitelist them?

regards,
Gunther

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Those IP addresses change regularly and are not publicly listed on purpose. Please see FAQ - Let's Encrypt

Possible options are:

  • use the dns-01 challenge instead of http-01
  • whitelist requests for the /.well-known/acme-challenge/ path (HTTP)
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