DNS Gurus
Cached · just now
91/100 SECURITY SCORE

Certificate Information

Subject
CN=www.i-i.nl
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
November 28, 2025
Valid Until
February 26, 2026 60 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
F0:40:B0:7A:F6:15:3E:0E:7F:20:5E:3F:D4:E3:F7:ED:83:3E:6F:CA:4F:CC:F2:CA:68:46:40:D6:C8:94:5B:30
Alternative Names
10 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
Good
max-age=31536000; includeSubDomains
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Present
same-origin
Permissions-Policy
Missing
Not configured
Recommendations
  • • Consider adding 'preload' to HSTS for maximum security
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • Consider adding Permissions-Policy to control browser features

CAA Records (Certificate Authority Authorization)

CAA Records
Configured (Restricts certificate issuance)
Current Issuer
Authorized (Matches CAA policy)
Authorized CAs
letsencrypt.org ; validationmethods=http-01 pki.goog ; validationmethods=http-01
Recommendations
  • • Consider using critical flag (flags=128) for stricter CAA enforcement
  • • Consider adding 'iodef' records to receive notifications about unauthorized certificate issuance attempts
  • • Consider adding 'issuewild' records to control wildcard certificate issuance