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domain-intel

Passive domain reconnaissance using Python stdlib. Use this skill for subdomain discovery, SSL certificate inspection, WHOIS lookups, DNS records, domain availability checks, and bulk multi-domain analysis. No API keys required. Triggers on requests like "find subdomains", "check ssl cert", "whois lookup", "is this domain available", "bulk check these domains".

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  • SKILL.md1.1 KB

SKILL.md (original)

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Passive domain intelligence using only Python stdlib and public data sources. Zero dependencies. Zero API keys. Works out of the box.

Capabilities

  • Subdomain discovery via crt.sh certificate transparency logs
  • Live SSL/TLS certificate inspection (expiry, cipher, SANs, TLS version)
  • WHOIS lookup — supports 100+ TLDs via direct TCP queries
  • DNS records: A, AAAA, MX, NS, TXT, CNAME
  • Domain availability check (DNS + WHOIS + SSL signals)
  • Bulk multi-domain analysis in parallel (up to 20 domains)

Data Sources

  • crt.sh — Certificate Transparency logs
  • WHOIS servers — Direct TCP to 100+ authoritative TLD servers
  • Google DNS-over-HTTPS — MX/NS/TXT/CNAME resolution
  • System DNS — A/AAAA records

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