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Certificate SAN Checker

Check Subject Alternative Names and wildcard certificates.

🛠️ How to Use
  1. Enter a hostname to fetch a live certificate, or paste a certificate PEM.
  2. Click Check SANs.
  3. Review Common Name, SANs list, certificate type, and validity.
Example (PEM)
-----BEGIN CERTIFICATE-----\nMIIFazCCA1OgAwIBAgIR...\n-----END CERTIFICATE-----