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Dev tools · April 8, 2026

Subdomain Takeover Checker

Detect subdomain takeover vulnerabilities for free

What it does

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

Does the same job

all alternatives →
  • FS
    Fast subdomain enumerator written in Rust2022 · github.com · ▲23

    Hello! I'm learning Rust and also information security, so what better way to learn than to put a tool together practicing both skills? I've tried to use a couple of different tools for subdomain enumeration (part of the Discovery-party when it comes to penetration testing), but none of them were very fast, even if the DNS resolver I pointed them towards is, so I wrote my own tool that leverages concurrency to check a lot of subdomains, fast! It's written in Rust, main parts being using Tokio and async_channels, and I think it works good enough for a first release. I wanted to get recursive…

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