Web ratings
Web server
- https://www.ssllabs.com/ssltest/ - test SSL (HTTPS certificate, etc)
- https://securityheaders.io/ - test HTTP headers
- https://hstspreload.org/ - check HSTS and add it to preload list
- https://nat64check.ipv6-lab.net/ - check web server on IPv6 and Nat64
DNS records
- https://www.huque.com/bin/danecheck - check TLSA record
- https://caatest.co.uk/ - check CAA record
- http://dnsviz.net/ - check DNSSEC
Web
- https://developers.google.com/speed/pagespeed/ - site performance
- https://search.google.com/test/mobile-friendly - responsibility-test