DNS Gurus
Open Cached · just now
76/100 SECURITY SCORE

Certificate Information

Subject
C=DE, ST=Bayern, O=Friedrich-Alexander-Universitaet Erlangen-Nuernberg, CN=www.test.rrze.uni-erlangen.de
Issuer
C=GR, O=Hellenic Academic and Research Institutions CA, CN=GEANT TLS ECC 1
Valid From
November 28, 2025
Valid Until
November 28, 2026 345 days
Public Key
ECDSA 384 bit (P-384) Strong
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
E4:43:D0:9D:5D:7E:81:44:46:40:EB:DC:50:0C:9A:3D:AB:60:18:9A:92:83:FC:0C:8D:14:73:51:22:6D:B5:83
Alternative Names
6 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
Missing
Not configured
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 Strict-Transport-Security header with max-age of at least 1 year
  • • 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