Tier 1 ISPs
AT&T
Level 3
Qwest
Verizon Business
Global Crossing

Tier 2 ISPs
PCCW (buys traffic from Savvis)
Cogent Communications (buys traffic from Verio)
Telecom Italia (buys traffic from Verizon Business)
France Télécom (buys traffic from Sprint)
Tiscali International (buys traffic from Sprint)

Lancaster Local ISPs
D&E Communications
SysMatrix