DNS Gurus
Cached · just now
80/100 SECURITY SCORE

Certificate Information

Subject
CN=redlearning.org
Issuer
C=US, O=Google Trust Services, CN=WE1
Valid From
January 13, 2026
Valid Until
April 13, 2026 83 days
Public Key
ECDSA 256 bit (P-256) Adequate
Signature Algorithm
ECDSA-SHA256
SHA-256 Fingerprint
90:C9:06:A0:80:50:B0:05:5D:D5:6A:3E:C6:AD:9A:C3:1C:50:BF:DB:5D:A9:F7:C5:B2:2D:CD:52:CD:08:48:90
Alternative Names
2 domains

Security Configuration

TLS Protocols
TLS 1.0 TLS 1.1 TLS 1.2 TLS 1.3
Forward Secrecy
Supported (Modern clients use PFS)
Warnings
  • • TLS 1.1 is deprecated and should be disabled
  • • TLS 1.0 is deprecated and should be disabled

HTTP Security Headers

Status
Strict-Transport-Security
Missing
Not configured
Content-Security-Policy
Weak
upgrade-insecure-requests
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
  • • Significantly strengthen CSP directives
  • • 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
Configured (Restricts certificate issuance)
Current Issuer
Authorized (Matches CAA policy)
Authorized CAs
comodoca.com digicert.com ; cansignhttpexchanges=yes globalsign.com letsencrypt.org pki.goog ; cansignhttpexchanges=yes sectigo.com ssl.com
Wildcard CAs
globalsign.com letsencrypt.org pki.goog ; cansignhttpexchanges=yes sectigo.com ssl.com comodoca.com digicert.com ; cansignhttpexchanges=yes
Recommendations
  • • Consider using critical flag (flags=128) for stricter CAA enforcement
  • • You have authorized 7 CAs - consider limiting to only the CAs you actively use
  • • Consider adding 'iodef' records to receive notifications about unauthorized certificate issuance attempts

Subject Alternative Names

2 domains
redlearning.org *.redlearning.org