Tier 2 network

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A Tier 2 Network is an Internet service provider who engages in the practice of peering with other networks, but who still purchases IP transit to reach some portion of the Internet.

Tier 2 providers are the most common providers on the Internet as it is much easier to purchase transit from a Tier 1 network than it is to peer with them and then attempt to push into becoming a Tier 1 carrier.

The term Tier 3 is sometimes also used to describe networks who solely purchase IP transit from other networks (typically Tier 1 or Tier 2 networks) to reach the Internet.

[edit] See also

• Tier 1 network
• IP Transit
• Peering point
• Network Access Point

[edit] List of Large or Important Tier 2 IPv4 ISPs

• PCCW Global (formerly Beyond the Network Access (BTN)) AS3491 (Buys transit from Savvis AS3561)
• Cogent Communications AS174 (buys transit from Verio, AS2914)
• France Télécom AS5511 (buys transit from Sprint, AS1239)
• Tiscali International AS3257 (buys transit from Sprint, AS1239)
• Telecom Italia Sparkle (Seabone) AS6762 (buys transit from Verizon Business, AS701 and Sprint, AS1239)
• XO Communications AS2828 (buys transit from Sprint, AS1239)
• nLayer AS4436 (buys from GBLX/AS3549 and SAVVIS/AS3561)

[edit] List of Medium Sized International Tier 2 IPv4 ISPs

• Connexions 4 London - C4L AS25577 (Buys transit from Tiscali, AS3257 and Level3, AS3356 and Abovenet, AS6461)
• On Tap Networks AS39755 (Buys transit from Level3 AS3356, Global Crossing AS3549, AboveNet AS6461, Teleglobe AS6453, KPN AS286 and Cogent AS3549)