Info

The data presented here is derived from Certificate Transparency logs currently monitored by Cloudflare. Learn how CT monitoring works.

Certificate Transparency for Let's Encrypt 'Willow2027h2'

Log information

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Operator
Let's Encrypt
APIThe interface a CT log supports for serving log data to clients — either the dynamic APIs defined in RFC 6962 or the read-path HTTP static asset hierarchy.
static-ct-api
StateLog state in Chrome's CT program
Usable
Acceptance windowThe log will only accept certificates that expire (have a NotAfter date) between these dates.
Documentation
https://log.willow.ct.letsencrypt.org/2027h2/
Logs from the same operator
NameStateLog state in Chrome's CT programAcceptance window
Oak2024h2Rejected
Oak2025h1Rejected
Oak2025h2Rejected
CT log information is derived from the Google Chrome log list

Log activity for Willow2027h2

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Certificate inclusion activity and growth rate for this CT log

Included13,667
Not included but eligible90,615

Log growth rate (past 7 days): 11 entries/hour

Log performance for Willow2027h2

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Performance of the log over the past 90 days, as observed by Cloudflare's CT monitor

20%40%60%80%100%
add-chain-new
add-chain-old
add-pre-chain-new
add-pre-chain-old
get-entries
get-roots
get-sth
Average uptime99%
143 ms287 ms430 ms573 ms716 ms
add-chain-new
add-chain-old
add-pre-chain-new
add-pre-chain-old
get-entries
get-roots
get-sth
Average response time273 ms

Certificate characteristics

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Information on the technical makeup of certificates

Public key algorithm

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Distribution of certificates by public key algorithm, reflecting the cryptographic methods used to establish secure connections

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Signature algorithm

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Distribution of certificates by signature algorithm, used by the issuer (CA) to sign the certificate

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Validation level

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Distribution of certificates by validation level, indicating the type of identity verification performed during issuance

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Certificate duration

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Distribution of certificate based on validity period (between NotBefore and NotAfter dates)

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Certificate issuance

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Certificate issuance is the process by which CAs generate digital certificates for domain owners. CAs are often operated by larger organizations, who may manage multiple subordinate CAs under a single corporate umbrella

Certificate authority owners

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Distribution of certificate issuance across the top CA owners

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Certificate authorities

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Distribution of certificate issuance across the top CA certificates

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Latest Certificates Transparency blog posts

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Posts tagged with "Certificates Transparency" from the Cloudflare blog

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