We have a Windows server with 100+ websites hosted on it.
Some tools like whoishostingthis.com provide hosting provider's name and tools like domaintools.com provide domain names of websites hosted on a specific IP using reverse IP feature.
What we are looking for is to hide the server ip so that it can make hard for others to find the websites/domain names hosted on our server and hosting provider of our server.
We tried cloudflare.com for this. It sits between visitor and our hosting provider. So, cloudflare's dns is set to our domains which avoids exposing our server Ip. But, cloudflare is really expensive for bulk domains and their free plan has some limitations. We do not need additional features which cloudflare offers like CDN or caching.
We tried 3rd party DNS services like Amazon Route 53 or dnsmadeeasy.com, but whoishostingthis.com was still able to tell host provider's name.
What is the simplest way to achieve this? We understand that a determined person still can find these details, but we at lest want to make this task harder. What services we should search? Main concern is pricing as we have 100+ domains.