DNSLOOKUP

SSL Certificate Checker

Validate SSL certificates and security configuration for any website.

SSL Certificate Checker

Enter a hostname to check its SSL certificate and TLS configuration.

Enter a domain name (e.g., example.com) or hostname

Default is 443 (HTTPS). Change only if the server uses a non-standard SSL/TLS port.

About SSL Certificates

SSL/TLS certificates are digital certificates that authenticate the identity of a website and enable an encrypted connection. These certificates are essential for securing sensitive information transmitted over the internet.

Why SSL Certificates Matter

  • Data Encryption: Protects sensitive information during transmission
  • Authentication: Verifies the identity of the website you're connecting to
  • Trust: Builds user confidence and improves SEO rankings
  • Compliance: Helps meet regulatory requirements for data protection

Common SSL Issues

  • Expired Certificates: Certificates that have passed their validity period
  • Self-signed Certificates: Certificates not issued by a trusted Certificate Authority
  • Weak Cipher Suites: Using outdated or insecure encryption methods
  • Mismatched Hostnames: Certificate issued for a different domain than the one being accessed
  • Incomplete Certificate Chains: Missing intermediate certificates

Best Practices

  • Use Strong Keys: RSA keys should be at least 2048 bits
  • Modern TLS Versions: Use TLS 1.2 or 1.3, avoid older versions
  • Regular Renewal: Renew certificates before they expire
  • OCSP Stapling: Improve performance and privacy of certificate validation
  • Certificate Transparency: Ensure certificates are logged in public CT logs

Security Score

Our SSL checker evaluates multiple aspects of your certificate and TLS configuration to generate a security score. This includes certificate validity, key strength, signature algorithm, protocol version, and cipher suite security. A higher score indicates better protection against potential vulnerabilities.

SSL CHECKER FAQs

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