Tier 2 providers are the most common Internet service providers as it is much easier to purchase transit from a Tier 1 network than it is to peer with them and attempt becoming a Tier 1 carrier.
| Name | AS Number | September 2016 degree[1][2] | Reason |
|---|
| Hurricane Electric | 6939 | 4809 | IPv4: Buys 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] |
| Interoute | 8928 | 552 | Uses transit from GTT/AS3257.[6] |
| Korea Telecom | 4766 | 492 | Buys 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 | Buys transit from Verizon/AS701. |
| KDDI | 2516 | 310 | Buys transit from Level3/AS3356, Tata Communications/AS6453, Verizon/AS701, Global Telecom & Technology (GTT)/AS3257, CenturyLink/AS209. |
| Internet Initiative Japan | 2497 | 307 | Buys transit from NTT America/AS2914, Verizon/AS701. |
| SK broadband | 9318 | 484 | Buys transit from Tata Communications/AS6453, Verizon/AS701, Telia Carrier/AS1299, NTT America/AS2914, [https://www.chinatelecomglobal.com China Telecom]/AS4134&AS4809. |
| Vodafone (formerly Cable and Wireless) | 1273 | 336 | Buys transit from Telia Carrier/AS1299. |
| Vodafone (formerly ARCOR AG Germany) | 3209 | 166 | Buys transit from Level3/AS3356, Telia Carrier/AS1299, Verizon Enterprise Solutions (formerly UUNET)/AS701, nLayer Communications/AS4436, Pacnet/AS10026.[7] |
| Telkom Indonesia International | 7713 | 258 | Buys transit from Level3/AS3356, Cogent/AS174, Telia Carrier/AS1299, NTT America/AS2914, Telecom Italia Sparkle/AS6762, Tata Communications/AS6453. |
| TDC | 3292 | 221 | Buys transit from Sprint/AS1239, NTT America/AS2914. |
| Virgin Media | 5089 | 192 | Buys transit from GTT/AS3257, Liberty Global/AS6830. |
| Comcast | 7922 | 160 | Buys transit from Tata Communications/AS6453, NTT America/AS2914. |
| PT Mora Telematika Indonesia | 23947 | 158 | Buys transit from NTT America/AS2914, GTT/AS3257, Tata Communications/AS6453. |
| British Telecom | 5400 | 155 | Buys transit from Telia Carrier/AS1299 and NTT America/AS2914, Global Telecom & Technology (GTT)/AS4436. |
| Easynet | 4589 | 108 | Buys transit including NTT America/AS2914, GTT/AS3257. |
| Tele2 (formerly SWIPNet) | 1257 | 107 | Buys transit from Sprint/AS1239, Cogent/AS174. |
| Fibrenoire | 22652 | 79 | Buys transit from Level3/AS3356, Tata Communications/AS6453, GTT/AS3257. |
| [https://www.spiritcom.com/ Spirit Communications] | 2711 | 70 | Buys transit from Level3/AS3356, Cogent/AS174, Telia Carrier/AS1299, NTT America/AS2914, GTT/AS3257, Hurricane Electric/AS6939. |
| FiberRing | 38930 | 59 | Buys transit from NTT America/AS2914, Telia Carrier/AS1299, Tata Communications/AS6453, Cogent/AS174. |
| Internap | 14744 | 43 | Buys transit from Cogent/AS174, NTT America/AS2914, XO Communications/AS2828, AboveNet/AS6461, CenturyLink/AS209, AT&T/AS7018. |
| KCOM Group | 12390 | 37 | Buys transit from KPN/AS286, Level 3/AS3356, Cogent/AS174, NTT America/AS2914. |
| Stealth Communications | 8002 | 28 | Buys transit from Tata Communications/AS6453, Cogent/AS174, NTT America/AS2914. |
| RETN | 9002 | 620 | Buys transit from Level 3/AS3356, NTT America/AS2914. |
|
1. ^CAIDA AS ranking
2. ^Visualizing Internet Topology at a Macroscopic Scale April 2005
3. ^{{Cite web|url=http://as-rank.caida.org/?mode0=as-info&mode1=as-table&as=6939|title=CAIDA AS Rank|accessdate=2015-07-29|date=2016-01-25}}
4. ^1 {{cite web|url=http://mailman.nanog.org/pipermail/nanog/2016-March/084611.html|title=Cogent - Google - HE Fun|date=2016-03-09}}
5. ^{{cite web|title=No connectivity to Cogent IPv6 network|url=https://www.sixxs.net/tickets/?msg=tickets-8635922|website=www.sixxs.net|accessdate=5 February 2017|language=en}}
6. ^{{Cite news|url=https://www.interoute.com/press-release/gtt-completes-acquisition-interoute|title=GTT Completes Acquisition of Interoute|date=2018-05-31|work=Interoute|access-date=2018-07-18|language=en}}
7. ^{{cite web|title=CAIDA AS Rank|url=http://as-rank.caida.org/?mode0=as-info&mode1=as-table&as=1273|website=as-rank.caida.org|accessdate=25 August 2017}}
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