I wouldn't say it is impossible, however it is not something we're able to help you with.
I am not very familiar with the entire process, AFAIK you would have to:
1) register with ARIN.
2) request an IP address block. You must submit a standard form explaining how exactly are you going to utilize addresses and that you indeed need as many as requested. I'm not sure if one can request a block smaller than /24
3) if your request is approved and the range is assigned to you, it is your responsibility to make all necessary arrangements for advertising/routing addresses to your hardware.
We do fully whitelabel, however, this is what looks like a custom database of webhosts and their IP ranges. They probably just associated privatesystems with us, so now, unfortunately search a domain that resolves to our IPs now shows KnownHost on this particular website.