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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",

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@kevinnftkevinnft@kevinnft
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ai-agent-skills
14169 skills

Claude Code

$ npx -y skills add kevinnft/ai-agent-skills --skill domain-intel --agent claude-code

SKILL.md

domain-intel.SKILL.md
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
origin: original
language: en

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
Read it on GitHub ↗
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2
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Python
Language
MIT
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Created

Repo: kevinnft/ai-agent-skills

In this plugin
169 skills
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@kevinnft
Ships withai-agent-skills

191 attribution-first agent skills for Hermes Agent, Claude Code, Cursor — one installer, 28 categories, searchable catalog. See NOTICE for upstream attribution.

14169 skills
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Questions about domain-intel.

Which coding agents can use domain-intel?
domain-intel installs in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI, using each agent's flag shown on this page. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.