Convert text to binary and the other way for any string input.
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 octal and the other way for any string input.
Get & verify the meta tags of any website.
Take an IP and try to look for the domain/host associated with it.
Get all the HTTP headers that an URL returns for a typical GET request.
Separate text back and forth by new lines, commas, dots...etc.
Convert a particular date to the unix timestamp format.
Get approximate IP details.