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not only cogent, only 2 cogent from 23 using backbones:
AboveNet #1 (1Gbps)
AboveNet #2 (1Gbps)
AboveNet #3 (1Gbps)
Broadwing (1Gbps)
nLayer (1Gbps)
AT&T #1 (1Gbps)
AT&T #2 (1Gbps)
AT&T #3 (1Gbps)
Global Crossing #1 (1Gbps)
Global Crossing #2 (1Gbps)
Level3 #1 (1Gbps)
Level3 #2 (1Gbps)
Level3 #3 (1Gbps)
Sprint #1 (1Gbps)
Sprint #2 (1Gbps)
Time Warner (1Gbps)
UUNET (1Gbps)
Verio #1 (1Gbps)
Verio #2 (1Gbps)
Dallas Public Peering #1 (1Gbps)
Cogent #1 (1Gbps)
Cogent #2 (1Gbps)
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