The following nine (9) networks are the only Tier 1 ISPs:
Name AS Number Mid-2007 degree[1][2]
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AOL Transit Data Network (ATDN) 1668 36
AT&T 7018 2079
Global Crossing (GX) 3549 944
Level 3 3356 1393
Verizon Business (formerly UUNET) 701 2644
NTT Communications (formerly Verio) 2914 524
Qwest 209 394
SAVVIS 3561 520
Sprint Nextel Corporation 1239 1700
