And you have managed all that from one single IPv4 address?
[Congrats on your efficiency!]
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No, I currently manage about 20,000 primary domain names for each C segment of the public network, and each primary domain name uses multiple domain name certificates @ and * resolution records
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What's that? I've never heard of it.
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I use Google Translate, my English is not good, so I am very sorry that I bother you
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A certificate contains two, similar to this
abc.com
*.abc.com
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It is not a bother.
We are here for this - for you.
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It's no bother, I just try to understand and/or learn something new 
A certificate with a "*" is called a "wildcard certificate".
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I use a multi-domain certificate containing two domain names to generate a certificate. Each certificate can cover all three-level subdomains of a single main domain name. I am rate limited. I can only generate 300 certificates for 3 hours using a single account. , This is not enough, I want to increase my rate limit, but I submitted a ticket to no effect, it may be that they do not understand my description, there is a communication barrier.
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It is a short week in the U.S. and many people may be out on holiday/vacation time.
But I have reached out to two LE staff members that either might be able to review your request (upon their return to work and within their available time schedule).
Please bare with us as we try to resolve your problem.
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thank you very much!
Rudy Gomez via Let's Encrypt Community Support <letsencrypt@discoursemail.com> δΊ2021εΉ΄11ζ24ζ₯ε¨δΈ δΈε2:20ειοΌ
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