Ok. Odd.

With my limited knowledge, I am thinking that they have placed their website with another host provider but not removed your logo from it. Even though the IP is within your IP range (here's where I start looking dumb) can it not have the same address IP address if the DNS is pointing to a different host? The DNS woudl resolve to the host and then the host allocate an IP in the same range as yours but on it's 'local' hosting network.

I need an aspirin...!

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