OpenSSL cheatsheet
Display SAN of an SSL connections, example for google.com: openssl s_client -host google.com -port 443 | openssl x509 -noout -ext subjectAltName
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Display SAN of an SSL connections, example for google.com: openssl s_client -host google.com -port 443 | openssl x509 -noout -ext subjectAltName