Put it to work
Potential use cases
A starting use for this source
Monitor a company's domains and brand for newly issued certificates, identify unexpected subdomains or certificate issuance, and trigger security or customer-notification workflows. SaaS security founders, domain-monitoring products and developer tools that need near-real-time certificate visibility.
Find a technical research angle
Turn an observable infrastructure or performance pattern into a research question for your audience. Explain what the measurement captures before drawing conclusions about user experience or demand.
What it covers
Geography and granularity
Geography: Use the geography stated by the source; coverage can vary by dataset and release.
Granularity: Monitor a company's domains and brand for newly issued certificates, identify unexpected subdomains or certificate issuance, and trigger security or customer-notification workflows.
Source type: TLS certificate issuance and domain-security observability
Access and cost
Public source
Publicly auditable log ecosystem: the official log list identifies current usable logs, and the logs are append-only ledgers of certificates created, updated and expired.
Cost: Current price was not established in this review; check the provider's access terms.
Update cadence: Release cadence was not normalized in this review; check the source's dates, update notes, and API limits before comparing periods.
Before you use it
Limits that matter
CT is a log ecosystem rather than one canonical database: coverage and querying depend on participating logs and their operational status, and the official page's list is explicitly current/usable rather than permanent.; The log list spans logs operated by different organizations and jurisdictions; visibility depends on certificates submitted to participating CT logs, not on a geographic census of every TLS deployment.; Logs preserve issuance-related history as append-only records, including certificates created, updated and expired; the official page specifically lists current usable logs, so operators and availability can change.