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Make sure your passwords are good enough.
Get all the HTTP headers that an URL returns for a typical GET request.
Get all possible details about an SSL certificate.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Check whether a website is using the new HTTP/2 protocol or not.
Take an IP and try to look for the domain/host associated with it.
Get all possible details about a domain name.