domain-intel

Subdomain discovery and SSL certificate inspection can be performed using only Python stdlib and public data sources like certificate transparency logs. This approach requires zero external APIs or keys, directly querying public infrastructure to enumerate subdomains and inspect TLS versions, ciphers, and expiry dates.

Bulk WHOIS lookups and DNS record checks support parallel analysis of up to 20 domains simultaneously. The process queries DNS for A, AAAA, MX, NS, TXT, and CNAME records while performing direct TCP WHOIS queries across 100+ TLDs for batch domain monitoring.

Passive domain intelligence gathers security information from public data sources without actively scanning the target. Certificate transparency subdomain discovery works by querying public logs like crt.sh to find historical SSL certificates, revealing associated subdomains without direct interaction with the target domain.

Domain security audits can be executed without any API keys or external dependencies. The process relies entirely on the Python standard library, utilizing standard TCP and HTTP connections to query public data sources for WHOIS, SSL, and DNS information out of the box.

Domain availability is checked by combining DNS resolution, WHOIS registry data, and SSL certificate signals. This method aggregates multiple public data sources to determine if a domain is registered, has active DNS records, and presents a valid SSL certificate.