List of Tier 1 Networks
These networks are believed to be tier 1 networks, in that they do not have overt settlements with any other network.
| Name | Headquarters | AS number | January 2011 degree | Peering policy |
|---|---|---|---|---|
| AT&T Inc. | USA | 7018 | 2365 | AT&T Peering policy |
| CenturyLink (formerly Qwest and Savvis) | USA | 209 / 3561 | 1367 | North America; International |
| Deutsche Telekom AG | Germany | 3320 | 535 | DTAG Peering Details |
| XO Communications | USA | 2828 | 2904 | XO Peering Policy |
| Telecom Italia Sparkle (Seabone) | Italy | 6762 | 344 | Seabone Peering Policy |
| Inteliquent (formerly Tinet) | USA | 3257 | 886 | Inteliquent Peering Policy |
| Verizon Business (formerly UUNET) | USA | 701 | 1946 | Verizon UUNET Peering policy 701, 702, 703 |
| Sprint | USA | 1239 | 1183 | |
| TeliaSonera International Carrier | Sweden | 1299 | 630 | TeliaSonera International Carrier Global Peering Policy |
| NTT Communications (formerly Verio) | Japan | 2914 | 718 | |
| Level 3 Communications (formerly Level 3 and Global Crossing) | USA | 3356 / 3549 / 1 | 4402 | Level 3 Peering Policy |
| Tata Communications (formerly Teleglobe) | India | 6453 | 569 | Peering Policy |
| Telefonica | Spain | 12956 | 150 | Peering Policy |
| Zayo_Group formerly AboveNet | USA | 6461 | 1066 | AboveNet Peering Policy |
While most of these Tier-1 providers offer global coverage (based on the published network map on their respective public websites), there are some which are restricted to being geographically regional players in North America and do not have a global network footprint especially when it comes to IP Transit services e.g. AT&T and CenturyLink. However these do offer global coverage for mobiles and IP-VPN type services which are unrelated to being a Tier-1 provider.
A 2008 report shows Internet traffic relying less on U.S. networks than previously.
The following networks were tier 1 networks and may still be, but there is some question in the community as to whether they are now paying settlements to one or more of their peers:
| Name | AS number | September, 2007 degree | Peering policy |
|---|---|---|---|
| AOL Transit Data Network (ATDN) | 1668 | ATDN Peering Policy |
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