Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Generate a paypal payment link with ease.
Generate whatsapp message links with ease.
Get all the HTTP headers that an URL returns for a typical GET request.
Generate deep link mailto with subject, body, cc, bcc & get the HTML code as well.