Convert text to hexadecimal and the other way for any string input.
Convert text to ascii and the other way for any string input.
Convert text to decimal and the other way for any string input.
Convert text to octal and the other way for any string input.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Make sure your passwords are good enough.
Get & verify the meta tags of any website.
Get approximate IP details.
Get the gravatar.com globally recognized avatar for any email.
Get details of any file type, such as the mime type or last edit date.