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 all possible details about an SSL certificate.
Get the gravatar.com globally recognized avatar for any email.
Check if the URL is cached or not by Google.
Easily generate your own custom signature and download it with ease.
Separate text back and forth by new lines, commas, dots...etc.