certificate-transparency

Discover subdomains from Certificate Transparency logs by querying crt.sh for a target domain and extracting Subject Alternative Names. This process retrieves certificate records, parses SANs, and deduplicates entries to produce a clean inventory of unique subdomains for reconnaissance.

Extracting Subject Alternative Names for reconnaissance involves parsing public CT log JSON data and deduplicating entries. This approach identifies unique subdomains, detects naming pattern conventions via regex, and flags wildcard certificate scopes to highlight potential security exposure.

Wildcard certificate detection in CT logs works by querying crt.sh, parsing certificate records, and flagging wildcard scopes within Subject Alternative Names. This highlights broad certificate usage that may expose multiple subdomains to potential security risks during asset discovery workflows.

You can use crt.sh JSON data for asset discovery and security auditing by fetching certificate records with wildcard filtering. The data is parsed to enumerate active subdomains, extract issuer metadata, and validate domain inventory for incident response scoping.

Querying Certificate Transparency logs requires rate-limit-aware behavior when fetching JSON from crt.sh. Applying wildcard filtering and parsing Subject Alternative Names with rate-limit awareness ensures reliable subdomain enumeration without triggering source restrictions during reconnaissance workflows.

Detect naming pattern conventions from SAN entries involves applying regex detection to parsed and deduplicated Subject Alternative Names extracted from CT logs. This infers internal environment and service naming conventions to support security review and domain inventory validation.