DNS Gurus
Open Cached · just now
76/100 SECURITY SCORE

Certificate Information

Subject
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=0110-01-040181, UNKNOWN={:asn1_OPENTYPE, <<19, 2, 74, 80>>}, C=JP, ST=Tokyo, L=Shibuya, UNKNOWN={:asn1_OPENTYPE, <<19, 15, 49, 45, 50, 45, 51, 32, 68, 111, 103, 101, 110, 122, 97, 107, 97>>}, O=GMO GlobalSign K.K., CN=tss.globalsign.com
Issuer
C=BE, O=GlobalSign nv-sa, CN=GlobalSign Extended Validation CA - SHA256 - G3
Valid From
May 01, 2025
Valid Until
June 02, 2026 210 days
Public Key
RSA 4096 bit Strong
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
72:CB:B3:6C:FE:B6:D0:39:81:4B:9C:05:A0:8D:68:97:C0:05:D1:01:23:37:0D:F0:66:13:3D:27:F9:F4:1E:0F
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
Missing
Not configured
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
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-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
  • • Add X-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
  • • Consider adding Permissions-Policy to control browser features

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