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 a domain name.
Ping a website, server or port..
Easily convert IDN to Punnycode and back.
Extract email addresses from any kind of text content.
Make sure your passwords are good enough.
Get all possible details about an SSL certificate.