DNS Gurus
Open Cached · just now
80/100 SECURITY SCORE

Certificate Information

Subject
UNKNOWN=CSM050470198, C=DE, ST=Hessen, L=Frankfurt am Main, O=Hessischer Rundfunk AoeR, CN=*.hr.de
Issuer
C=DE, O=D-Trust GmbH, CN=D-TRUST SSL Class 3 CA 1 2009
Valid From
September 19, 2025
Valid Until
September 21, 2026 317 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
4A:6C:5E:F6:C0:3D:51:46:C1:19:77:08:00:1C:D9:56:D6:F3:93:9E:11:1B:EE:27:E0:35:97:EE:AD:BA:6E:B8
Alternative Names
5 domains

Security Configuration

TLS Protocols
TLS 1.2 TLS 1.3
Forward Secrecy
Supported (Modern clients use PFS)

HTTP Security Headers

Status
Strict-Transport-Security
Excellent
max-age=31536000; includeSubDomains; preload
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
  • • Add X-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
  • • Consider adding Permissions-Policy to control browser features

CAA Records (Certificate Authority Authorization)

CAA Records
Not Configured (Any CA can issue certificates)
CAA Issues
  • • No CAA records configured - any CA can issue certificates
Recommendations
  • • Implement CAA records to restrict which CAs can issue certificates for your domain
  • • This adds an extra layer of security against unauthorized certificate issuance
  • • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
  • • Consider adding 'iodef' record to receive security incident reports