DNS Gurus

SSL/TLS Analysis for kotlinlang.org

Analyzed on November 02, 2025 at 19:09 UTC

Security Score
84 / 100

Certificate Information

Subject
CN=kotlinlang.org
Issuer
C=US, O=Amazon, CN=Amazon RSA 2048 M03
Valid From
September 06, 2025
Valid Until
October 04, 2026 336 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
DD:E9:EB:E4:03:91:3E:80:06:E1:E9:9C:2E:2F:12:B6:BA:CF:E1:B4:7A:9B:B4:5F:D3:10:A4:7D:FC:50:1C:18
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
Present
same-origin
Permissions-Policy
Missing
Not configured
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
  • • 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
amazon.com letsencrypt.org
Incident Reporting
Recommendations
  • • Consider using critical flag (flags=128) for stricter CAA enforcement
  • • Consider adding 'issuewild' records to control wildcard certificate issuance