On Demand TLS and source ip ranges

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1

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)

2

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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