Buy Bulk Hosting provides hosting for private blog networks. It uses companies like HostGator, A Small Orange and a number of other big hosting services.
Using Buy Bulk Hosting is easy. After you purchase an account just add your domains and they will automatically be allocated different IP addresses. The websites on your PBN can never be connected.
The user interface is well designed and easy to use, and for each domain you can see important metrics like Domain Authority and Citation Flow.
Although the service is stable and reliable its one drawback is that it is more expensive that several other good PBN hosting providers.