Tier 2 network
A Tier 2 network is an Internet service provider which engages in the practice of peering with other networks, but which also purchases IP transit to reach some portion of the Internet.
Tier 2 providers are the most common Internet service providers, as it is much easier to purchase transit from a Tier 1 network than to peer with them and attempt to become a Tier 1 carrier.
The term Tier 3 is sometimes also used to describe networks who solely purchase IP transit from other networks to reach the Internet.
List of large or important Tier 2 networks
| Name | AS Number | August 2020 degree[1][2] | Reason |
|---|---|---|---|
| Hurricane Electric | 6939 | 8092 | IPv4: Purchases transit from Telia Carrier/AS1299.[3] IPv6: Does not provide IPv6 routing/connectivity to Cogent/AS174.[4] |
| Cogent Communications (formerly PSINet) | 174 | 6062 | IPv6: Does not provide IPv6 routing/connectivity to Google/AS15169 or Hurricane Electric/AS6939.[4][5] |
| Telkom Indonesia International | 7713 | 2833 | Purchases transit from Level3/AS3356, Cogent/AS174, Telia Carrier/AS1299, NTT America/AS2914, Telecom Italia Sparkle/AS6762, Tata Communications/AS6453. |
| RETN | 9002 | 1446 | Purchases transit from Level 3/AS3356. |
| Korea Telecom | 4766 | 621 | Purchases transit from Cogent/AS174, Telia Carrier/AS1299, Tata Communications/AS6453, Hurricane Electric/AS6939, Global Telecom & Technology (GTT)/AS4436, Sprint/AS1239. |
| Fibrenoire | 22652 | 527 | Purchases transit from Level3/AS3356, Tata Communications/AS6453, GTT/AS3257. |
| SK broadband | 9318 | 489 | Purchases transit from Tata Communications/AS6453, Verizon/AS701, Telia Carrier/AS1299, NTT America/AS2914, China Telecom/AS4134&AS4809. |
| TDC | 3292 | 369 | Purchases transit from Sprint/AS1239, NTT America/AS2914. |
| Internet Initiative Japan | 2497 | 324 | Purchases transit from NTT America/AS2914, Verizon/AS701. |
| Vodafone (formerly Cable and Wireless) | 1273 | 314 | Purchases transit from Telia Carrier/AS1299. |
| KDDI | 2516 | 309 | Purchases transit from Level3/AS3356, Tata Communications/AS6453, Verizon/AS701, Global Telecom & Technology (GTT)/AS3257, CenturyLink/AS209. |
| PT Mora Telematika Indonesia | 23947 | 293 | Purchases transit from NTT America/AS2914, GTT/AS3257, Tata Communications/AS6453. |
| China Telecom | 4134/4809 | 239 | Purchases transit from Verizon/AS701. |
| British Telecom | 5400 | 202 | Purchases transit from Telia Carrier/AS1299 and NTT America/AS2914, Global Telecom & Technology (GTT)/AS4436. |
| Comcast | 7922 | 195 | Purchases transit from Tata Communications/AS6453, NTT America/AS2914. |
| Tele2 (formerly SWIPNet) | 1257 | 192 | Purchases transit from Sprint/AS1239, Cogent/AS174. |
| KCOM Group | 12390 | 90 | Purchases transit from KPN/AS286, Level 3/AS3356, Cogent/AS174, NTT America/AS2914. |
| Spirit Communications | 2711 | 77 | Purchases transit from Level3/AS3356, Cogent/AS174, Telia Carrier/AS1299, NTT America/AS2914, GTT/AS3257, Hurricane Electric/AS6939. |
| Stealth Communications | 8002 | 46 | Purchases transit from Tata Communications/AS6453, Cogent/AS174, NTT America/AS2914. |
| Internap | 14744 | 39 | Purchases transit from Cogent/AS174, NTT America/AS2914, XO Communications/AS2828, AboveNet/AS6461, CenturyLink/AS209, AT&T/AS7018. |
| FiberRing | 38930 | 36 | Purchases transit from NTT America/AS2914, Telia Carrier/AS1299, Tata Communications/AS6453, Cogent/AS174. |
| Easynet | 4589 | 9 | Purchases transit including NTT America/AS2914, GTT/AS3257. |
Small or less important Tier 2 networks
| Name | AS Number | August 2020 degree[1][2] | Reason |
|---|---|---|---|
| SG.GS | 24482 | 224 | Purchases IP transit from NTT, Cogent and TATA. Coverage and customer cone limited to SG. |
| Turk Telekom International (and Euroweb.ro) |
6663 | 75 | Purchases IP transit from Telia, GTT and NTT. Coverage and customer cone limited to TR & CEE. |
See also
- Peering point
- Network access point
References
- https://asrank.caida.org/
- Visualizing Internet Topology at a Macroscopic Scale April 2005
- "CAIDA AS Rank". 2016-01-25. Retrieved 2015-07-29.
- "Cogent - Google - HE Fun". 2016-03-09.
- "No connectivity to Cogent IPv6 network". www.sixxs.net. Retrieved 5 February 2017.
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