Overview
What crt.sh is good for
Certificate transparency search for finding certificates, domains, and subdomains associated with an organization.
Built for osint and attack surface workflows.
Useful when evaluating certificate transparency capabilities.
Helpful for certificates, subdomains, ct investigations and triage.
Evaluation guide
Quick decision notes
Investigators collecting public web, domain, URL, identity, and infrastructure evidence.
Confirm current pricing, data limits, account requirements, and licensing on the official site before production use.
#certificates · #subdomains · #ct
Use the categories, source links, and similar tools below to compare it with nearby options.
Use cases
Where it fits
Classification
Categories and tags
Sources
Official links and checks
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Sponsored
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Similar tools
DNS reconnaissance and subdomain mapping.
2 shared categoriesInternet asset and certificate search.
2 shared categoriesInfrastructure hunting and suspicious service discovery.
2 shared categoriesDNS, WHOIS, and infrastructure history.
2 shared categoriesPassive subdomain discovery.
2 shared categoriesAttack surface and threat intelligence search.
2 shared categoriesReviews
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FAQ
Questions about crt.sh
What is crt.sh used for?
crt.sh is used for certificate transparency workflows. Certificate transparency search for finding certificates, domains, and subdomains associated with an organization.
Is crt.sh free?
The listed pricing model is Free. Check the official site for exact plan limits, usage restrictions, and current commercial terms.
Which teams should evaluate crt.sh?
It is most relevant to teams working across osint, attack surface workflows.
What are alternatives to crt.sh?
Start with the similar tools section on this page. It highlights tools with overlapping categories, tags, and operational use cases.