Detects subdomain takeover vulnerabilities in seconds — free, no login required. Forgot to remove a DNS record after leaving Heroku, Vercel, or AWS? An attacker can claim that subdomain. SubdomainChecker follows the full CNAME chain and fingerprints 100+ services to tell you if you're at risk. → No data stored, no logging → Bulk check up to 10 subdomains → Open source
No reviews yetBe the first to leave a review for Subdomain Takeover Checker
Maker
📌
Hey Product Hunt! 👋
I built SubdomainChecker after noticing how many companies have dangling subdomains pointing to unclaimed services — a surprisingly common and easy-to-exploit vulnerability.
The tool is completely free, open source, and requires no login. Just paste a subdomain and it tells you within seconds whether it's vulnerable to takeover, who the service provider is, and the full CNAME chain.
Would love feedback from the security community here — happy to answer any questions!