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 all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Check if the URL is cached or not by Google.
Get approximate IP details.
Convert text to hexadecimal and the other way for any string input.