Let's Encrypt Certificate Application Limits

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Summary

  • Maximum 50 certificates per registered domain per week
  • Maximum 300 requests per account every 3 hours
  • Maximum 100 domains per certificate
  • Maximum 5 duplicate certificates per week
  • Renewal certificates are not restricted
  • Maximum 10 accounts per IP every 3 hours
  • Maximum 500 accounts per IPv6/48 every 3 hours

If you need to apply for certificates for many subdomains, you can combine maximum 50 certificates per registered domain per week and maximum 100 domains per certificate to achieve up to 5000 subdomain certificate applications per week.

Reference

https://letsencrypt.org/zh-cn/docs/rate-limits/