Subdomain Finder

Discover public subdomains using certificate transparency and DNS resolution checks.

What This Tool Checks

  • Common public subdomain names
  • Resolvable A and AAAA records
  • Initial external asset discovery signals

Security Coverage

Discover common live subdomains using safe DNS lookups for quick external attack surface visibility. The check helps collect quick evidence for Attack surface discovery and supports initial reconnaissance before deeper manual validation.

How Results Should Be Used

Use the output as a starting point for review, remediation planning, and retesting. Automated results should be validated by a qualified security professional before production changes are made.

Report Context

  • Category: Reconnaissance
  • Estimated scan time: 15-40 sec
  • Risk area: Attack surface discovery
  • Tags: Subdomains, DNS, Recon

When to Request Manual Validation

Automated checks are useful for fast visibility, but they do not replace manual VAPT. If the tool reports missing controls, exposed records, risky headers, certificate issues, weak configuration, or unclear evidence, PentestHint can validate the finding, assess business impact, and provide remediation guidance in a structured security report.

Frequently Asked Questions

What does Subdomain Finder check?

Subdomain Finder checks Common public subdomain names, Resolvable A and AAAA records, Initial external asset discovery signals.

Is this a replacement for full VAPT?

No. This tool provides quick evidence and reconnaissance. Full VAPT includes manual validation, chained risk analysis, and remediation review.

What should I do after finding an issue?

Review the evidence, apply the recommended fix, and retest after remediation.

Talk to PentestHint

Contact PentestHint to discuss scope, business context, timelines, evidence requirements, and practical next steps for improving security posture.