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A Tier 1 network can reach the globally reachable Internet without buying IP transit. It does so through its own routes and peering relationships with other networks that together provide global reach. “Tier 1” describes an interconnection and commercial position, not an official rank issued by a universal Internet authority.
What makes a network Tier 1?
The defining condition is reachability without purchased upstream transit: the network can deliver traffic to the entire Internet routing table through its own routes and peering relationships. A large backbone, extensive infrastructure, or a large routing table alone does not establish that condition.
An autonomous system (AS) is a network, or group of networks, administered under a common authority and participating in Internet routing. Networks exchange route information across interconnections. Transit and peering are the two principal ways they interconnect, according to Arcep’s interconnection glossary.
How transit and peering differ
| Interconnection | What it provides | Typical commercial arrangement |
|---|---|---|
| Transit | A provider carries a customer’s traffic to and from destinations beyond the provider’s own customers, according to the agreement’s scope. This gives the customer broader Internet connectivity. | The customer pays the provider. |
| Peering | Two networks exchange traffic, traditionally for their respective customers or destinations. | It may be settlement-free or paid; terms and policies vary. |
The Internet Society’s guide to interconnection and charging practices explains the distinction between transit and settlement-free peering. Settlement-free means the networks do not pay one another for the exchanged traffic under that arrangement; it does not mean their infrastructure or interconnection has no cost. Networks still bear their own costs, and peering can also be paid.
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How Tier 1, Tier 2, and Tier 3 are commonly distinguished
The tier labels are a simplified way to describe upstream and downstream relationships, not a complete map of Internet topology. In the conventional teaching model, the distinctions are:
| Common label | Typical relationship to transit | Typical role |
|---|---|---|
| Tier 1 | Does not buy upstream transit to reach the globally reachable Internet. | Uses its routes and peering relationships to provide global reach. |
| Tier 2 | May buy transit and also peer with other networks. | Combines purchased reach with direct exchanges. |
| Tier 3 | Commonly buys transit. | Uses an upstream provider to connect end users to the Internet. |
These are conventional descriptions, not rigid categories for every network. The ITU-T report on international Internet connectivity also describes arrangements in which regional networks peer directly and bypass traditional Tier 1 networks. Real interconnection patterns can therefore be more complex than a simple three-level hierarchy.
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Does a Tier 1 network pay for Internet transit?
By the usual definition, no: it does not purchase transit to obtain global Internet reach. That does not mean it pays nothing to move traffic. It may bear infrastructure and interconnection costs, and peering itself can be paid or settlement-free depending on the agreement. The label concerns the network’s ability to reach the Internet without buying upstream transit, not whether every exchange is costless.
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No universal standards-based registry or binding classification is established by these sources. The criteria used to decide which networks qualify can vary, as can the networks’ interconnection relationships. Arcep’s glossary gives a criteria-sensitive explanation and cites a 2025 list attributed to Wikipedia, while noting that classification may be disputed. That example is not an official roster.
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The IETF’s RFC 9518, “Centralization, Decentralization, and Internet Standards”, refers to Tier 1 networks in the context of transit supply; it does not define a formal tier system or list qualifying operators. For the same reason, a network’s size or a name on an undated list is not enough to establish Tier 1 status.
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How to interpret the label
- Ask whether the network can reach the globally reachable Internet without buying transit; that is the central test.
- Distinguish its transit purchases from its peering arrangements. Peering may be paid or settlement-free.
- Treat Tier 1, Tier 2, and Tier 3 as a useful simplification, not a universal or exhaustive classification.
- When an operator is called Tier 1, check which source and criteria support the label rather than assuming there is an official, permanent roster.
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