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 decimal and the other way for any string input.
Extract email addresses from any kind of text content.
Get the web-host of a given website.
Get approximate IP details.
Get all possible details about a domain name.
Parse details from user agent strings.
Check if the URL is cached or not by Google.