domain-infra-history
crt.sh (Cert Transparency)
A queryable window into Certificate Transparency logs, the public record of TLS certificates, which makes it a way to uncover historical certificates and subdomains for a domain. You query it on the website, and the same query can return JSON without a key. Researchers use it to reconstruct a domain's infrastructure history. It is frequently overloaded and errors out under load, so retry if a query fails.
Программная проверка недоступна, откроется собственный поиск архива.
Чем полезен и как работает
Researchers reach for crt.sh when they need to map every subdomain and certificate ever issued for a domain, revealing infrastructure that may not appear in DNS records or web searches. It is operated by Sectigo and aggregates public Certificate Transparency logs, the mandatory public ledger that certificate authorities must log to before issuing TLS certificates. You query it by entering a domain name, with a wildcard prefix to catch subdomains. Echo links you to your query on crt.sh and you run the search there; note that the service is frequently under heavy load and may time out, so a retry often succeeds.
Что внутри
The Certificate Transparency logs that crt.sh aggregates collectively record roughly 15 billion certificates issued since CT logging became widespread. Coverage spans all major public CAs and grows continuously as new certificates are logged daily.
Доступ по API
https://crt.sh/?q=%25 .<domain>&output=json (keyless; often overloaded)
Доступ
Catalogue link only, open the archive to search it yourself.