I am going to say this once, I have ONE IP, NOT TWO, NOT THREE, NOT EVEN FOUR, BUT ONE!!!!
My internet account offers proxy if I choose to have that, but I am told by my service provider that I do not have a proxy, it is not selected in my browser settings, I am not behind a firewall.
And I would tend to believe what my service provider says over what some faulty IP checker says.
These search engine's who are using these IP checker program's are ruining it for their searcher's and for the customer's that want their sites seen. How do they excpect an advertiser to get visitor's to their site this way if a person can't even do an honest search?