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.

Comprobación de seguridad instantánea y gratuita – sin necesidad de cuentaAnálisis de seguridad instantáneo y gratuito — sin necesidad de cuenta

¿Cómo se compara tu sitio?

Introduzca un dominio. Obtenga su calificación de seguridad, puntuación y un desglose detallado — en segundos.

Verificamos certificados SSL, cabeceras de seguridad, DNSSEC, autenticación de correo, cifrado SMTP y más.

Qué verificamos

Cada sitio se analiza semanalmente en estas dimensiones de seguridad. Las puntuaciones se calculan en una escala de 100 puntos.

Cabeceras de seguridad

25 pts

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

Certificado

20 pts

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

Autenticación

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 escaneo muestra el problema. El monitoreo continuo lo previene.

Empiece gratis. Un monitor, alertas SSL y de dominio, bot de Telegram — sin tarjeta de crédito.

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