DNS Gurus
Open Cached · just now
89/100 SECURITY SCORE

Certificate Information

Subject
C=US, ST=California, O=California Institute of Technology, CN=caltech.edu
Issuer
C=US, O=Internet2, CN=InCommon RSA Server CA 2
Valid From
November 11, 2025
Valid Until
November 11, 2026 364 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
4F:D6:AC:E1:9D:B0:8C:10:10:3E:0F:67:14:E3:FF:86:15:FF:6D:36:74:10:09:FE:06:06:41:2F:4C:A0:B8:B0
Alternative Names
42 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
Basic
base-uri; font-src; frame-src; +11 more
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Present
accelerometer=(), camera=(), gyroscope=(), magnetometer=(), microphone=()
Recommendations
  • • Add Strict-Transport-Security header with max-age of at least 1 year
  • • Improve CSP by adding more specific directives and removing 'unsafe-inline'

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