Take an IP and try to look for the domain/host associated with it.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get approximate IP details.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Get all the HTTP headers that an URL returns for a typical GET request.
Extract email addresses from any kind of text content.
Check whether or not a website is using the new HTTP/2 protocol or not.