SSL

https://hackertarget.com/nikto-tutorial/

https://mxtoolbox.com/SuperTool.aspx - DNS, A, MX, NS etc etc checker
https://dnsmap.io/#A/ - dns propagácia
https://www.iplocation.net/ - IP location
https://apps.db.ripe.net/db-web-ui/#/query 
https://www.sslshopper.com/ssl-checker.html#hostname= - SSL checker