DNS Gurus
Cached · just now
81/100 SECURITY SCORE

Certificate Information

Subject
CN=datakeeper.impres.nl
Issuer
C=US, O=Let's Encrypt, CN=E8
Valid From
November 17, 2025
Valid Until
February 15, 2026 51 days
Public Key
ECDSA 384 bit (P-384) Strong
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
06:CF:DC:B7:D2:E2:75:F4:7D:9A:1A:9F:57:9B:A0:0B:2E:BD:7C:9D:84:B1:19:9E:15:A5:D5:12:2E:8B:13:D3
Alternative Names
4 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
Good
SAMEORIGIN
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Present
interest-cohort=()
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-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)

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

Subject Alternative Names

4 domains
datakeeper.nl prodimpres.datakeeper.nl www.datakeeper.nl

Other domains in certificate

datakeeper.impres.nl