Investigate subdomains, SSL certificates, domain registration details, and DNS records with a Python helper. Run checks across multiple domains, estimate registration availability, and receive structured JSON results without additional packages or API keys.
中文简介正在准备中。当前显示英语简介。
Passive recon of subdomains, SSL certs, WHOIS, and DNS.
安装前可以查看交给 AI 代理的指令内容。
Passive domain reconnaissance using only Python stdlib. Zero dependencies. Zero API keys. Works on Linux, macOS, and Windows.
This skill includes scripts/domain_intel.py — a complete CLI tool for all domain intelligence operations.
# Subdomain discovery via Certificate Transparency logs
python SKILL_DIR/scripts/domain_intel.py subdomains example.com
# SSL certificate inspection (expiry, cipher, SANs, issuer)
python SKILL_DIR/scripts/domain_intel.py ssl example.com
# WHOIS lookup (registrar, dates, name servers — 100+ TLDs)
python SKILL_DIR/scripts/domain_intel.py whois example.com
# DNS records (A, AAAA, MX, NS, TXT, CNAME)
python SKILL_DIR/scripts/domain_intel.py dns example.com
# Domain availability check (passive: DNS + WHOIS + SSL signals)
python SKILL_DIR/scripts/domain_intel.py available coolstartup.io
# Bulk analysis — multiple domains, multiple checks in parallel
python SKILL_DIR/scripts/domain_intel.py bulk example.com github.com google.com
python SKILL_DIR/scripts/domain_intel.py bulk example.com github.com --checks ssl,dns
SKILL_DIR is the directory containing this SKILL.md file. All output is structured JSON.
| Command | What it does | Data source |
|---|---|---|
subdomains | Find subdomains from certificate logs | crt.sh (HTTPS) |
ssl | Inspect TLS certificate details | Direct TCP:443 to target |
whois | Registration info, registrar, dates | WHOIS servers (TCP:43) |
dns | A, AAAA, MX, NS, TXT, CNAME records | System DNS + Google DoH |
available | Check if domain is registered | DNS + WHOIS + SSL signals |
bulk | Run multiple checks on multiple domains | All of the above |
web_search for general research about what a domain/company doesweb_extract to get the actual content of a webpageterminal with curl -I for a simple "is this URL reachable" check| Task | Better tool | Why |
|---|---|---|
| "What does example.com do?" | web_extract | Gets page content, not DNS/WHOIS data |
| "Find info about a company" | web_search | General research, not domain-specific |
| "Is this website safe?" | web_search | Reputation checks need web context |
| "Check if a URL is reachable" | terminal with curl -I | Simple HTTP check |
| "Find subdomains of X" | This skill | Only passive source for this |
| "When does the SSL cert expire?" | This skill | Built-in tools can't inspect TLS |
| "Who registered this domain?" | This skill | WHOIS data not in web search |
| "Is coolstartup.io available?" | This skill | Passive availability via DNS+WHOIS+SSL |
Pure Python stdlib (socket, ssl, urllib, json, concurrent.futures).
Works identically on Linux, macOS, and Windows with no dependencies.
All queries are passive — no port scanning, no vulnerability testing:
Contributed by @FurkanL0
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中文简介正在准备中。当前显示英语简介。
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