Get approximate IP details.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port.
Get & verify the meta tags of any website.
Get the web-host of a given website.
Check if the URL is banned and marked as safe/unsafe by Google.
Check if the URL is cached or not by Google.
Make sure your passwords are good enough.
Get details of any file type, such as the mime type or last edit date.