DNS Gurus
Cached · just now
90/100 SECURITY SCORE

Certificate Information

Subject
CN=*.help.overdrive.com
Issuer
C=US, O=Google Trust Services, CN=WR1
Valid From
December 29, 2025
Valid Until
March 29, 2026 60 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
FE:FF:83:B2:DC:7A:67:CD:E5:97:45:71:71:8D:56:D3:D6:88:0B:F3:74:47:49:FB:35:0D:87:F7:53:3A:96:85
Alternative Names
12 domains

Security Configuration

TLS Protocols
TLS 1.2
Forward Secrecy
Limited (Check cipher configuration)
Warnings
  • • TLS 1.3 is not supported (recommended)

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
Good
no-referrer-when-downgrade
Permissions-Policy
Present
microphone=(), geolocation=(), camera=(), display-capture=(), payment=(), autoplay=()
Recommendations
  • • Consider adding 'preload' to HSTS for maximum security
  • • Add Content-Security-Policy header to prevent XSS attacks

CAA Records (Certificate Authority Authorization)

CAA Records
Configured (Restricts certificate issuance)
Current Issuer
Authorized (Matches CAA policy)
Authorized CAs
pki.goog ; validationmethods=dns-01 letsencrypt.org ; validationmethods=dns-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