How do I disable reverse IP whois/ check on my server?

Hi:
I host a few sites on one server, all using the same shared IP address. I notice that people can easily go to say, http://www.whois.sc/, enter one of my domains, and do a reverse IP check to see all my sites hosted on the server. Is there anyway to disable this ability? I gather it has to do with reverse IPs.

Thanks,

 

 

 

 

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