Let's Encrypt Certificate Issuance Limits

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TL;DR

  • At most 50 certificates per registered domain per week
  • At most 300 new-order requests per account per 3 hours
  • At most 100 domains per certificate
  • At most 5 duplicate certificates per week
  • Renewal certificates are exempt from these limits
  • At most 10 accounts created per IP address per 3 hours
  • At most 500 accounts created per IPv6 /48 per 3 hours

If you need certificates for many sub-domains, combine “50 certificates per registered domain per week” with “100 domains per certificate” to issue up to 5,000 sub-domains per week.

References

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