DNS Gurus
Cached · just now
90/100 SECURITY SCORE

Detected Technologies

See all in URL Inspect 2
Let's Encrypt logo Let's Encrypt Cloudflare Turnstile logo Cloudflare Turnstile

Certificate Information

Subject
CN=support.vitalsource.com
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
April 06, 2026
Valid Until
July 05, 2026 58 days
Public Key
RSA 4096 bit Strong
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
12:77:49:58:8E:D2:CE:5F:7E:1A:29:58:FD:7C:1D:B5:76:8D:1B:3E:04:B3:EE:27:C9:10:E9:B3:D2:1B:7B:53
Alternative Names
11 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
Cloudflare Turnstile logo
Basic
default-src; script-src; script-src-attr; +8 more Analyze
Content-Security-Policy-Report-Only
Missing
Not configured Analyze
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Present
same-origin
Permissions-Policy
Present
accelerometer=(), browsing-topics=(), camera=(); +15 more
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