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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 approximate IP details.
Get all possible details about an SSL certificate.
Ping a website, server or port..
Get details of any file type, such as the mime type or last edit date.
Get the gravatar.com globally recognized avatar for any email.