ASN GRAPH

ASN Connection Graph

How a network reaches the internet: who its upstreams are, how much each carries, and whether it connects to Tier 1 backbones and Chinese carriers.

Enter an ASN to see its upstream mix, peers and downstream customers.

How this works

What the ASN graph shows

The internet is not one network but tens of thousands of autonomous systems (AS) connected to each other. This page lists the BGP relationships of one ASN: who it buys transit from and in what proportion, how many networks it peers with, and who it provides access to.

Three kinds of relationship

The relationships between AS networks determine how traffic flows, and say a lot about a network's quality and stability:

Upstream / transit — networks it buys bandwidth from. Fewer upstreams means fewer fallbacks when something breaks
Peers — equals that exchange traffic, usually without payment. More peers means shorter paths and lower latency
Downstream / customers — networks that buy access from it. Many downstreams indicate an operator with real scale

Why this bears on IP quality

An ASN's position in the topology affects how its addresses behave. A small ASN hanging off a single upstream with no peering is typically a reseller or a short-term rented facility, and blocks like these get flagged wholesale more often.

Conversely, a carrier-scale ASN with extensive peering carries large volumes of genuine user traffic, so its residential ranges are far less likely to be misclassified.

What Tier 1 means

Tier 1 means the handful of carriers that buy transit from no one and reach the whole internet through peering alone; there are only a dozen or so worldwide. The larger the share of Tier 1 backbones among a network's upstreams, the closer it sits to the core of the internet.

Common questions

Where does the data come from, and how often is it updated?

From public BGP routing data. Routing relationships do not change often in practice, barring acquisitions, an upstream switch, or a policy change.

Why do some ASNs have only one or two upstreams?

A small ASN really does have just one or two upstreams and no peering, so a short list is what it actually looks like. Enterprise ASNs and small hosting resellers are typical examples.

Are more upstreams always better?

More upstreams mean redundancy, which is good for availability when a link fails. It does not directly translate to cleaner addresses — that depends far more on how the network uses and allocates them.