DNS Gurus
Open Cached · just now
91/100 SECURITY SCORE

Certificate Information

Subject
UNKNOWN={:asn1_OPENTYPE, <<19, 2, 67, 90>>}, UNKNOWN={:asn1_OPENTYPE, <<12, 20, 80, 114, 105, 118, 97, 116, 101, 32, 79, 114, 103, 97, 110, 105, 122, 97, 116, 105, 111, 110>>}, UNKNOWN=49437381, C=CZ, L=Brno, O=ZONER a.s., CN=czechia.com
Issuer
C=US, O=DigiCert Inc, CN=GeoTrust EV RSA CA G2
Valid From
November 18, 2025
Valid Until
December 19, 2026 376 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
76:5E:E9:76:5F:CC:63:37:B4:20:CE:78:FE:13:78:43:E5:41:C5:0E:34:2B:B0:28:6B:5A:4C:84:DD:6B:F5:1C
Alternative Names
20 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
Present
max-age=63072000
Content-Security-Policy
Basic
connect-src; default-src; font-src; +10 more
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Present
accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()
Recommendations
  • • Increase HSTS max-age to at least 1 year and add includeSubDomains
  • • 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