Free domain security scan
Enter any domain. In about thirty seconds you get its email authentication, certificate, DNS and website hardening posture — scored, prioritised, with the fix for each problem.
DMARC checker
Enter a domain and we will read its DMARC record, tell you whether it is actually enforcing, and show you exactly what to publish if it is not.
SPF record checker
We resolve the full SPF record, follow every <code>include:</code> and <code>redirect=</code>, and count the DNS lookups it actually costs.
SSL certificate checker
We make one TLS connection, read the certificate, and check expiry, trust, hostname coverage and protocol support.
Security headers checker
We fetch the site once and inspect the response headers that control how browsers protect your visitors.