DNS Gurus
Cached · just now
85/100 SECURITY SCORE

Certificate Information

Subject
CN=sentryone.com
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
November 21, 2025
Valid Until
February 19, 2026 38 days
Public Key
RSA 3072 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
D8:A8:79:7B:8E:D5:4B:3C:05:A0:4D:0C:4D:C6:F5:FC:05:50:B2:FF:A2:D8:BC:C5:C4:88:0F:C3:CC:36:15:9F
Alternative Names
49 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
Weak
max-age=0
Content-Security-Policy
Weak
object-src; base-uri; frame-ancestors
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Increase HSTS max-age to at least 1 year and add includeSubDomains
  • • Significantly strengthen CSP directives
  • • 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