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Subdomain Takeover Scanner

Find CNAME records that point at unclaimed SaaS or hosting services and may be vulnerable to takeover.

Best for teams auditing DNS after vendor offboarding, marketing campaign teardowns, or broader subdomain inventory reviews.

Read remediation guide

Mode guidance: Quick mode is public for fast diagnostics. Comprehensive mode is reserved for account-backed workflows so results, follow-up, and broader analysis can stay tied to the right workspace.

What This Tool Checks

  • CNAME fingerprint matching
  • Live response verification
  • Common SaaS provider coverage

Why It Matters

Forgotten DNS records that still point at decommissioned SaaS or hosting services can let attackers claim the upstream resource and impersonate your brand.

Best For

Best for teams auditing DNS after vendor offboarding, marketing campaign teardowns, or broader subdomain inventory reviews.

What To Do Next

Remove stale CNAME records or reclaim the upstream service immediately, then add decommissioning checks to your DNS change workflow.

Related Resources

Read The GuideRead The Fix PageSee Plans

What does the Subdomain Takeover Scanner look for?

Subdomain Takeover Scanner focuses on cname fingerprint matching, live response verification, common saas provider coverage. It is designed to help teams identify this category of weakness quickly and then move into broader workflows if deeper follow-up is needed.

What is the difference between Quick and Comprehensive mode?

Quick mode stays public for focused diagnostics. Comprehensive mode is intended for authenticated workflows where users need saved history, richer follow-up, and broader account-linked execution.

When should I use the full Vulnify platform instead?

Use the full platform when you need more than one focused diagnostic, want to keep reports and history, or need scheduled scans, exports, and broader vulnerability coverage beyond subdomain takeover scanner.