Cloudflare Radar Now Shows How Your AS Connects to the Internet!

Hi, it's me, Shiichan! Today I found an update that lets you peek behind the curtain of the internet. It's the kind of thing that gets me excited, like looking at a map.

Cloudflare Changelog developers.cloudflare.com

What was announced?

From Cloudflare's Changelog: two new widgets landed in the Routing section of Cloudflare Radar. Available on AS (Autonomous System) pages like AS13335, they show how a network reaches the rest of the internet — the paths it takes toward Tier-1 networks, and the mix of direct upstream providers carrying its routes. Both are built from RouteViews RIB snapshots, unioned across selected collectors.

The story so far

Until now, prefix pages had a "Real-time connectivity" graph for a single prefix, like 1.1.1.0/24. But there wasn't a way to see, at the AS level, how a whole network connects to the rest of the internet.

What changes

These two widgets give you the big picture of an AS's connectivity at a glance.

• AS-level connectivity graph: aggregates the BGP paths from the queried AS to Tier-1 networks, across every prefix that AS announces, reading left to right. Each node is labeled with its AS number, country, and organization, and Tier-1 nodes stand apart from the rest.
• Upstream providers widget: a stacked time-series area chart tracking how much of an AS's observed paths each direct upstream carries. The top 10 upstreams get their own series, and the rest are grouped as "Other."

Being able to see transit relationships and upstream shifts visually is what makes this genuinely useful.

Dive Deep

By default, the AS-level connectivity graph shows only direct connections to Tier-1 networks plus indirect paths, which keeps it readable. Flipping the "Show full paths" toggle expands it to every observed path, including transit through Tier-1 networks the AS already connects to. An IPv4/IPv6 selector is also available, since the paths to Tier-1 networks can differ between address families.

Think of this graph as the AS-level counterpart to the "Real-time connectivity" graph on prefix pages. Instead of covering a single prefix, it unions the paths across every prefix an AS announces, making it a fast way to read a network's transit hierarchy.

If you want the raw data, two new API endpoints are available too:

• /bgp/routes/paths/{asn} — returns AS route segments, observed path counts, and peer counts
• /bgp/routes/upstreams/{asn}/timeseries — returns time-series upstream share data

Wrap-up

• Cloudflare Radar's Routing section gets an AS-level connectivity graph and an Upstream providers widget
• Both visualize routes and upstream composition at the AS level, built from RouteViews RIB snapshots
• The "Show full paths" toggle and IPv4/IPv6 selector let you control the level of detail
• New API endpoints let you pull the data into your own tools
• Great for network engineers and security researchers who want transparency into how an AS (their own or someone else's) connects to the internet