Certs

SSL

Fetch SSL certificate information from server

nmap -p 443 --script ssl-cert <url>/32 or
openssl s_client -connect <URL HERE>:443
Copy and paste the text starting with -----BEGIN CERTIFICATE----- and ending in -----END CERTIFICATE-----, inclusive, into a file xyz.pem
openssl x509 -in xyz.pem -text

Java JKS

Open jks truststore keytool -list -v -keystore <certname.jks>