I know isprime is located in the building where all servers are. So when there is a problem, then can walk in a few minutes to my server.(if needed)
However, they do not own the DC they use. (as far as I know) Of course they have their own ip's etc. And also the BW providers thay carry are many many
http://www.fixedorbit.com/AS/23/AS23393.htm
Not sure what having an AS number means since I'm just a user. But they do have their own
Andre