domain-intel

name	domain-intel
description	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".
license	MIT

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