DNS Gurus
Open Cached · just now
66/100 SECURITY SCORE

Certificate Information

Subject
CN=onfweb1.opennetworking.org
Issuer
C=AT, O=ZeroSSL, CN=ZeroSSL RSA Domain Secure Site CA
Valid From
August 05, 2025
Valid Until
November 03, 2025 Expired
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA384-RSA
SHA-256 Fingerprint
D8:92:FC:8B:57:64:30:1C:B6:3A:F8:E5:4A:83:78:05:1C:01:D2:32:A8:C5:42:B4:74:2A:38:98:32:6D:B5:64
Alternative Names
6 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