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Free Domain Security Check

Audit your domain in 30 seconds — DNS, TLS, email authentication, security headers and IP reputation, scored A to F.

We only check public DNS, HTTPS and email records. No login or scanning required.

This audit runs five quick checks against your domain from the public internet — no login, no scanning of internal systems. Results are cached for six hours per domain.

  • DNS & Reachability: Confirms the domain resolves and that nameservers and mail records are in place.
  • TLS Certificate: Checks that HTTPS is enabled, the certificate is valid, and TLS protocols are up to date.
  • Email Authentication: Verifies SPF, DKIM and DMARC are published to stop spoofed mail being sent in your name.
  • HTTP Security Headers: Looks for HSTS, CSP, X-Frame-Options and other browser-side protections.
  • IP Reputation: Cross-references your mail-server IP against widely used blacklists.

A passing grade here is the floor, not the ceiling. Real-world security requires monitoring, identity controls and incident response — areas this free check does not cover.