DNS Gurus

SSL Verification Bypassed

The server's SSL certificate could not be verified. The analysis was completed using insecure mode. Data may be less reliable.

Reason:

Hostname Mismatch - certificate is issued for mail.adm.tools, mail.ukraine.com.ua, web431.default-host.net, not for mail.psy-school.com

Cached · just now
89/100 SECURITY SCORE

Detected Technologies

See all in URL Inspect 19
Gravatar logo Gravatar Let's Encrypt logo Let's Encrypt Active incidents YouTube logo YouTube BootstrapCDN logo BootstrapCDN Cloudflare Turnstile logo Cloudflare Turnstile Facebook logo Facebook Google Analytics logo Google Analytics Google API JS Client logo Google API JS Client Google DoubleClick logo Google DoubleClick Google Fonts logo Google Fonts Google Maps logo Google Maps Google Search logo Google Search Google Static File Front End logo Google Static File Front End Google Tag Manager logo Google Tag Manager Highcharts logo Highcharts jsDelivr logo jsDelivr Stripe logo Stripe Vimeo logo Vimeo Google Cloud logo Google Cloud

Certificate Information

Subject
CN=mail.adm.tools
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
April 18, 2026
Valid Until
July 17, 2026 65 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
00:DF:F3:7A:67:AF:40:31:2A:6C:03:4A:2B:0E:A7:AF:0C:85:04:3D:3A:AC:9D:E9:59:CA:BA:51:78:89:A3:30
Alternative Names
3 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
Excellent
max-age=31536000; includeSubDomains; preload
Content-Security-Policy
YouTube logo
Good
default-src; form-action; child-src; +10 more Analyze
Content-Security-Policy-Report-Only
Missing
Not configured Analyze
X-Frame-Options
Excellent
Deny
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Present
accelerometer=(self), autoplay=(self), camera=(self); +21 more
Recommendations
  • • Strengthen CSP by removing 'unsafe-eval'
  • • Add X-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)

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