On Demand TLS and source ip ranges

I have a web server that filters incoming web traffic, i.e. allow list. What are the IP ranges of ZeroSSL and LetsEncrypt validators? (Want to add them to my allow list)

Let’s Encrypt intentionally doesn’t publish theirs, and they can change without notice.

I’m not sure about ZeroSSL, but I would bet something similar.

If you can’t accept external connections then you have to use the DNS challenge.

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