Question about CPM ads

[Kishin]

Is there any CPM ad network that allows a network of sites ?
I run multiple sites and was wondering if they would accpet them like that or would I have to apply seperately ?
Thanks

 

[ZuraX]

There has to be one out there. A while back I had one contact me and ask if I would display their ads on my banner exchange. I emailed back asking if they really would pay me to display their ads on my members sites, never got a reply. I now forget the name of the place.