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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 all possible details about an SSL certificate.
Validate JSON content and make it looks good.
Get the gravatar.com globally recognized avatar for any email.
Get details of any file type, such as the mime type or last edit date.
Get the web-host of a given website.
Convert markdown snippets to raw HTML code.
Get & verify the meta tags of any website.