Raise a contact us and ask to have your reverse DNS entry changed to your IP address.
Click contact us link bottom left then click new query -> technical support -> static IP / Reverse DNS setup -> change my reverse DNS
Then read the info page shown then enter the request to change your reverses DNS to your IP address.
Any normal IP lookup will resolve to your domain name. I suspect the webpage you saved was dynamically created and during the creation a script did a reverse DNS lookup to get you details. You cannot prevent a reverse DNS lookup but you can change what it reports.