Website Recon
Passive reconnaissance of a domain using public, browser-accessible data sources.
- DNS records over HTTPS: A, AAAA, MX, NS, TXT, CAA, SOA, DNSSEC
- Email security: SPF, DMARC, MTA-STS, TLS-RPT, BIMI and common DKIM selectors
- Subdomains and certificate history from Certificate Transparency logs
- RDAP domain registration and IP network ownership
- HSTS preload status, Wayback Machine history, security.txt checks
More free security tools
- Threat Modeling: Model components, data flows and trust boundaries, generate STRIDE threats with mitigations, rate risk and export a Markdown report with a Mermaid diagram.
- Dev Toolbox: Decode and lint JWTs, evaluate Content-Security-Policy, grade HTTP security headers and cookies, encode/hash data and scan code for leaked secrets, all locally.
- Review Checklists: Run secure code reviews with OWASP Top 10:2025, API Security Top 10 and ASVS 5.0 checklists, record pass/fail with notes and paste the summary into your PR.
- Dependencies & CI: Check package-lock, yarn.lock, requirements.txt, pom.xml, go.sum and more against OSV.dev, and generate GitHub Actions for CodeQL, Dependabot, gitleaks and Trivy.
- Data Lab: Chain 100+ operations into recipes: Base64, hex, URL, AES-GCM, HMAC, PBKDF2, MD5/SHA, gzip, XOR brute force, IOC extraction and defanging, with Magic auto-detect.
- PKI Tools: Decode and lint X.509 certificates, chains, CSRs and CRLs, generate CSRs and keys, match keys to certificates, convert PEM/DER/P7B/JWK. Nothing is uploaded.
- AI Skill Scanner: Scan SKILL.md files, agent instructions, MCP server configs and Claude Code hooks for prompt injection, data exfiltration, hidden Unicode and dangerous commands.
Source code on GitHub (open source).