What does the SiteGuardian security scanner check?

The scanner checks SSL/TLS certificates, 6 security headers (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy), DNSSEC, email authentication (SPF, DKIM, DMARC), SMTP encryption, MTA-STS, DANE/TLSA, CAA records, and DNS exposure. Results are scored 0-100 with an A-F grade.

Is the security scanner free?

Yes, completely free. No account, no signup, no credit card needed. Enter any domain and get instant results.

How is the security score calculated?

The score is out of 100 points: Security Headers (25 pts), SSL/TLS (20 pts), Email Authentication (15 pts), DNS Security (15 pts), HTTPS Enforcement (10 pts), security.txt (5 pts), MTA-STS + TLS-RPT (5 pts), and Server Hardening (5 pts). Grade A = 90-100, B = 75-89, C = 60-74, D = 40-59, F = 0-39.

Which compliance frameworks does the scan map to?

Scan findings are mapped to GDPR, NIS2, CRA (Cyber Resilience Act), ISO 27001, SOC 2, PCI DSS, and other EU regulatory frameworks. Each finding shows which regulations it affects.

Where is the scan data processed?

All scans run from EU-hosted infrastructure in Germany. No data is transferred outside the EU. Scan results are cached temporarily and not stored permanently unless you create an account.

Gratuito — sin necesidad de cuenta

Comprobación gratuita de seguridad web

Introduce un dominio. Obtén tu calificación de seguridad, tu puntuación y un desglose detallado — en segundos.

Comprobamos certificados SSL, cabeceras de seguridad, DNSSEC, autenticación de correo electrónico, cifrado SMTP y mucho más.

Basado en datos de 814,441+ sitios web europeos. Ver el benchmark

Qué comprobamos

Tu sitio web se analiza en estas dimensiones de seguridad. Cada una se puntúa de forma independiente.

Cabeceras de seguridad

25 pts

HSTS, CSP, X-Frame-Options, X-Content-Type, Referrer-Policy, Permissions-Policy

SSL/TLS Certificate

20 pts

Key strength, signature algorithm, chain depth, TLS version, HTTPS redirect

Autenticación de correo

15 pts

SPF, DKIM key strength, DMARC policy enforcement, MTA-STS, TLS-RPT, SMTP encryption

Seguridad DNS

15 pts

DNSSEC validation, CAA records, DANE/TLSA, DoH consistency

security.txt

5 pts

Vulnerability disclosure contact per RFC 9116

Privacidad del servidor

5 pts

No version disclosure, no X-Powered-By, restricted CORS headers

Enter a domain

Type any URL — we handle the rest. No login, no signup, no credit card.

We scan everything

SSL, headers, DNS, email auth, SMTP encryption — checked in seconds from our EU servers.

See your grade

A-to-F grade, 0-100 score, and detailed recommendations for every finding.

Un análisis muestra el problema. La monitorización continua lo previene.

Monitoreo continuo — uptime, SSL, DNS, autenticación de correo. Desde 29 €*/mes.

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