ISPs

Teir 1 ISPs AOL Transit Data Network (ATDN)
AT&T
Global Crossing (GX)
Level 3
Verizon Business (formerly UUNET)
NTT Communications (formerly Verio)
Qwest
SAVVIS
Sprint Nextel Corporation
TeliaSonera

Tier 2 ISPs

• PCCW Global (formerly Beyond the Network Access (BTN)) AS3491 (Buys transit from Savvis AS3561)
• Cogent Communications AS174 (buys transit from Verio, AS2914)
• France Télécom AS5511 (buys transit from Sprint, AS1239)
• Tiscali International AS3257 (buys transit from Sprint, AS1239)
• Telecom Italia Sparkle (Seabone) AS6762 (buys transit from Verizon Business, AS701 and Sprint, AS1239)

Local/Tier 3 ISPs

• PCCW Global (formerly Beyond the Network Access (BTN)) AS3491 (Buys transit from Savvis AS3561)
• Cogent Communications AS174 (buys transit from Verio, AS2914)
• France Télécom AS5511 (buys transit from Sprint, AS1239)
• Tiscali International AS3257 (buys transit from Sprint, AS1239)
• Telecom Italia Sparkle (Seabone) AS6762 (buys transit from Verizon Business, AS701 and Sprint, AS1239)

main resource:: en.wikipedia.org/