Major part of our servers are located at globalcompass and internap datacenters in Atlanta. We also have several servers in Seattle, Dallas and New Yourk generally for the backup nameserver hosting and remote backup storage.
Here is a list of connection our globalcompass datacenter has:
http://www.globalcompass.com/network-stats.htm
Internap maintains their own worldwide network with peering to major world and US networks. Atlanta Internap DC is connected to their superb network with 7 Gigabit of redundant pipes.