--- title: BadDNS: Open-source tool checks for subdomain takeovers description: BadDNS is an open-source Python tool for detecting domain and subdomain takeovers. It distinguishes itself by not only identifying takeover opportunities in... canonical: https://daily.dev/posts/baddns-open-source-tool-checks-for-subdomain-takeovers-vf8ak26cg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: BadDNS: Open-source tool checks for subdomain takeovers | daily.dev og:description: BadDNS is an open-source Python tool for detecting domain and subdomain takeovers. It distinguishes itself by not only identifying takeover opportunities in... og:url: https://daily.dev/posts/baddns-open-source-tool-checks-for-subdomain-takeovers-vf8ak26cg og:image: https://api.daily.dev/og/posts/Vf8ak26CG.png og:image:alt: BadDNS: Open-source tool checks for subdomain takeovers og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # BadDNS: Open-source tool checks for subdomain takeovers **[Community Picks](https://daily.dev/sources/community)** · 3 min read · 10 upvotes · 0 comments ## Summary BadDNS is an open-source Python tool for detecting domain and subdomain takeovers. It distinguishes itself by not only identifying takeover opportunities in CNAME, NS, and MX records but also by inspecting client-side references and CSP/CORS headers for vulnerabilities. Additionally, it automates the update of takeover signatures from reputable sources, ensuring users stay protected against the latest threats. BadDNS is available for free on GitHub, with future developments planned to include support for additional DNS record types and DNSSEC vulnerabilities. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#security](https://daily.dev/tags/security), [#cyber](https://daily.dev/tags/cyber), [#open-source](https://daily.dev/tags/open-source), [#dns](https://daily.dev/tags/dns) [View this post on daily.dev](https://daily.dev/posts/baddns-open-source-tool-checks-for-subdomain-takeovers-vf8ak26cg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"BadDNS: Open-source tool checks for subdomain takeovers","url":"https://daily.dev/posts/baddns-open-source-tool-checks-for-subdomain-takeovers-vf8ak26cg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/baddns-open-source-tool-checks-for-subdomain-takeovers-vf8ak26cg"},"datePublished":"2025-02-03T13:51:16.610Z","dateModified":"2025-02-03T13:51:42.869Z","description":"BadDNS is an open-source Python tool for detecting domain and subdomain takeovers. 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