Dedicated IP and preventing reverse IP lookup question

Hi:
Lets say I have a dedicated server hosting 5 sites, one of them on a dedicated IP. Can someone find out what other sites are hosted on the same server through that domain/IP?

I realize that for domains that share the same IP, anyone can do a reverse lookup and easily see what other sites are hosted along with it (ie: via http://www.whois.sc/). With a dedicated IP, I gather that makes it impossible?

Thanks,

 

 

 

 

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