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..
Get the gravatar.com globally recognized avatar for any email.
Make sure your passwords are good enough.
Get the web-host of a given website.
Get details of any file type, such as the mime type or last edit date.
Check if the URL is cached or not by Google.
Convert your HSLA color format to HSV format.