What is Subdomain Takeover Checker?
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
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