Identifying Amazon hosts...

[Pedro David Marco]

Hi!
i have spam with this header:

 Received: from a48-115.smtp-out.amazonses.com (HELO 
a48-115.smtp-out.amazonses.com) (54.240.48.115)

Is there any way, based on its fqdn, to know whether an Amazon smtp host is 
public or dedicated?

Thanks!
Pedreter.