DNS Gurus
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81/100 SECURITY SCORE

Certificate Information

Subject
CN=3mf.io
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
October 09, 2025
Valid Until
January 07, 2026 56 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
73:11:A6:1B:F6:C6:F9:12:7D:A2:EE:0E:2C:44:25:35:0F:15:B2:7F:CC:F0:48:EC:B9:BC:A1:23:4D:7C:34:C7
Alternative Names
62 domains

Security Configuration

TLS Protocols
TLS 1.2 TLS 1.3
Forward Secrecy
Supported (Modern clients use PFS)

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