Mmcp.market

domain-intel skill

by kevinnft·kevinnft/ai-agent-skills·14 stars·MIT

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".

A100/100content scan

Is the domain-intel skill safe?

Clean: nothing in its files matched our rules. We read 1 file in the folder on 2026-09-28.

No findings.

Install the domain-intel skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description. 

git clone --depth 1 https://github.com/kevinnft/ai-agent-skills.git /tmp/ai-agent-skills
mkdir -p ~/.claude/skills
cp -r /tmp/ai-agent-skills/skills/domain/domain-intel ~/.claude/skills/domain-intel
available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

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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