The free, all-in-one tool that checks your domain's SPF, DMARC, DKIM, SSL/TLS, DNSSEC, and security headers in a single scan.
Domain security shouldn't require a PhD or a dozen browser tabs. Yet for years, checking whether your email authentication and DNS security were properly configured meant bouncing between multiple tools: one for SPF, another for DMARC, a third for SSL certificates, and so on. Each tool had its own interface, its own jargon, and its own way of presenting results.
We built Domain Security Scanner to solve that problem. One domain, one scan, six comprehensive security checks, all in seconds. Whether you're an IT administrator managing hundreds of domains, a small business owner who just wants to know if your emails are being spoofed, or a security professional running an audit, our tool gives you clear, actionable results without the complexity.
Every scan analyses your SPF records, DMARC policies, DKIM configuration, SSL/TLS certificates, DNSSEC deployment, and HTTP security headers. Instead of cryptic technical output, you get plain-language recommendations with step-by-step guidance on how to fix any issues we find.
Deep inspection of SPF, DMARC, and DKIM records to verify your email authentication is correctly configured and protecting against spoofing.
Certificate validation, protocol version checks, and cipher suite analysis to ensure your connections are encrypted and secure.
Verify that your domain uses DNS Security Extensions to protect against cache poisoning and man-in-the-middle attacks.
Comprehensive HTTP security header analysis including Content-Security-Policy, HSTS, X-Frame-Options, and more.
All six security checks run simultaneously in a single scan, delivering comprehensive results in seconds, not minutes.
Clear, jargon-free recommendations with step-by-step guidance on how to fix issues, designed for both experts and beginners.
We believe every domain deserves proper security, regardless of the owner's budget or technical expertise. Email spoofing, phishing attacks, and insecure connections affect businesses of all sizes. The tools to check for these vulnerabilities should be free, fast, and easy to understand.
That's why our core scanner will always be free. No sign-up required for basic scans, no artificial limits on the checks you can run, and no paywalled results. We offer premium features like monitoring, bulk scanning, and exportable reports for teams that need them, but the fundamental security checks are available to everyone.
Your privacy matters. We only query publicly available DNS records and HTTP headers. We never access your inbox, your server, or any private data. Scan results are not shared with third parties, and we don't sell data to anyone.
Domain Security Scanner is built and maintained by security professionals who understand that trust is earned through transparency. Our privacy policy is written in plain language, and we're committed to keeping it that way.
Domain Security Scanner is built by a team of security engineers and developers who have spent years working in email deliverability, DNS infrastructure, and web security. We built the tool we wished we had, and now it's yours to use.
Enter your domain and get a comprehensive security report in seconds. No sign-up required.
Scan Your Domain Free