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 September 2016 degree[1][2] Reason
Hurricane Electric 6939 4809 IPv4: Purchases transit from Telia Carrier/AS1299.[3]
IPv6: Does not provide IPv6 routing/connectivity to Cogent/AS174.[4]
Cogent Communications (formerly PSINet) 174 4641 IPv6: Does not provide IPv6 routing/connectivity to Google/AS15169 or Hurricane Electric/AS6939.[4][5]
Korea Telecom 4766 492 Purchases transit from Cogent/AS174, Telia Carrier/AS1299, Tata Communications/AS6453, Hurricane Electric/AS6939, Global Telecom & Technology (GTT)/AS4436, Sprint/AS1239.
China Telecom 4134/4809 151 Purchases transit from Verizon/AS701.
KDDI 2516 310 Purchases transit from Level3/AS3356, Tata Communications/AS6453, Verizon/AS701, Global Telecom & Technology (GTT)/AS3257, CenturyLink/AS209.
Internet Initiative Japan 2497 307 Purchases transit from NTT America/AS2914, Verizon/AS701.
SK broadband 9318 484 Purchases transit from Tata Communications/AS6453, Verizon/AS701, Telia Carrier/AS1299, NTT America/AS2914, China Telecom/AS4134&AS4809.
Vodafone (formerly Cable and Wireless) 1273 336 Purchases transit from Telia Carrier/AS1299.
Telkom Indonesia International 7713 258 Purchases transit from Level3/AS3356, Cogent/AS174, Telia Carrier/AS1299, NTT America/AS2914, Telecom Italia Sparkle/AS6762, Tata Communications/AS6453.
TDC 3292 221 Purchases transit from Sprint/AS1239, NTT America/AS2914.
Comcast 7922 160 Purchases transit from Tata Communications/AS6453, NTT America/AS2914.
PT Mora Telematika Indonesia 23947 158 Purchases transit from NTT America/AS2914, GTT/AS3257, Tata Communications/AS6453.
British Telecom 5400 155 Purchases transit from Telia Carrier/AS1299 and NTT America/AS2914, Global Telecom & Technology (GTT)/AS4436.
Easynet 4589 108 Purchases transit including NTT America/AS2914, GTT/AS3257.
Tele2 (formerly SWIPNet) 1257 107 Purchases transit from Sprint/AS1239, Cogent/AS174.
Fibrenoire 22652 79 Purchases transit from Level3/AS3356, Tata Communications/AS6453, GTT/AS3257.
Spirit Communications 2711 70 Purchases transit from Level3/AS3356, Cogent/AS174, Telia Carrier/AS1299, NTT America/AS2914, GTT/AS3257, Hurricane Electric/AS6939.
FiberRing 38930 59 Purchases transit from NTT America/AS2914, Telia Carrier/AS1299, Tata Communications/AS6453, Cogent/AS174.
Internap 14744 43 Purchases transit from Cogent/AS174, NTT America/AS2914, XO Communications/AS2828, AboveNet/AS6461, CenturyLink/AS209, AT&T/AS7018.
KCOM Group 12390 37 Purchases transit from KPN/AS286, Level 3/AS3356, Cogent/AS174, NTT America/AS2914.
Stealth Communications 8002 28 Purchases transit from Tata Communications/AS6453, Cogent/AS174, NTT America/AS2914.
RETN 9002 620 Purchases transit from Level 3/AS3356.

See also

References
  1. CAIDA AS ranking
  2. Visualizing Internet Topology at a Macroscopic Scale April 2005
  3. "CAIDA AS Rank". 2016-01-25. Retrieved 2015-07-29.
  4. "Cogent - Google - HE Fun". 2016-03-09.
  5. "No connectivity to Cogent IPv6 network". www.sixxs.net. Retrieved 5 February 2017.
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