Certificate Breakdown by Type
Domain96%Organization4%
Validation Level
ECDSA21%RSA79%
Public Key Algorithm
ECDSA SHA-2566%ECDSA SHA-38411%RSA SHA-25681%RSA SHA-3842%
Signature Algorithm
 
CT-Qualified Cert28%Cert15%Precert57%
Entry Type
Current15%Expired85%
Expired vs. Current
 
Issuing Certificate Authorities
Global Details

Precert Issuance Rate: 458,703 certs/hr
Precert Expiry Rate: 444,066 certs/hr

Legacy Algorithms

The tables below count the number of currently-valid certificates signed by widely trusted CAs that use insecure or deprecated algorithms.

Signature Algorithm #
SHA1-RSA162
Public-Key Algorithm #
(None)
Issuance per Day by Certificate Authority

This section shows the number of pre-certificates issued in the previous 30 days (based on the NotBefore field) per certificate authority, deduplicated across CT logs. Only pre-certificates are shown to avoid overrepresenting CAs that log both pre-certificates and their corresponding final certificates.

0M2M4M6M8M10M12MDateAuthority Name
Log Utilization by Large Certificate Authorities

This section shows the number of non-expired pre-certificates in known CT logs from a few particularly large certificate authorities. Anyone can submit a pre-certificate they find in one log to another log, but this currently shows that some CAs have a clear preference for certain CT logs when they issue a certificate containing embedded SCTs, while others submit to several logs equally.

Amazon Trust Services
DigiCert
GlobalSign nv-sa
GoDaddy
Google Trust Services LLC
IdenTrust Services, LLC
Internet Security Research Group
Sectigo
  • Google Argon2025h1
    342,100,595 pre-certs
  • Google Argon2025h2
    289,406,415 pre-certs
  • Google Argon2026h1
    96,306,640 pre-certs
  • Google Xenon2025h1
    646,401,162 pre-certs
  • Google Xenon2025h2
    158,523,718 pre-certs
  • Google Xenon2026h1
    36,107,348 pre-certs
  • DigiCert Nessie2025
    232,098,698 pre-certs
  • DigiCert Sphinx2026h1
    35,066,385 pre-certs
  • DigiCert Yeti2025
    543,931,752 pre-certs
  • Let's Encrypt Oak2025h1
    497,293,988 pre-certs
  • Let's Encrypt Oak2025h2
    42,599,887 pre-certs
  • Let's Encrypt Sycamore2025h1b
    918,314,623 pre-certs
  • Let's Encrypt Willow2025h1b
    924,342,351 pre-certs
  • Sectigo Mammoth2025h1
    2,051,021 pre-certs
  • Sectigo Sabre
    18,108,457 pre-certs
  • Cloudflare Nimbus2025
    815,445,705 pre-certs
  • Cloudflare Nimbus2026
    101,036,139 pre-certs
  • Cloudflare Research cftest2025h2a
    305,248,621 pre-certs
  • TrustAsia Log2025a
    5,678,966 pre-certs
  • TrustAsia Log2025b
    5,560,744 pre-certs