How Cloudflare Blocks 100 Billion Attacks Every Day

Added: 2026-05-25

[00:00:00]100 billion attacks every day. 20% of the internet behind one company. How does Cloudflare survive when nation-state attackers can't take it down? Step one, [music] anycast.

[00:00:10]Cloudflare doesn't have one data center.

[00:00:13]It has 330 across 120 countries. Every Cloudflare IP is announced from all of them at once. An attacker's packet doesn't travel. It hits the nearest edge node. The attack gets diluted before it ever reaches its target. Step two, edge filtering. The nearest server reads the packet header in microseconds. Rate limits, fingerprint matching, block lists. 90% of attack traffic dies right here before it touches any back-end compute. Step three, [music] ML behavior detection. The traffic that survives hits a model trained on every attack Cloudflare has ever seen. A user agent claiming to be Chrome but missing one TLS extension. A bot network pretending to be humans. The system fingerprints it instantly and challenges it. The genius.

[00:00:59]Because Cloudflare absorbs across 330 data centers, a 100 gigabit attack is just 300 megabits per node. The same attack that kills any single server gets digested across the network. The downside, when Cloudflare itself sneezes, half the internet goes dark with it. ChatGPT, Discord, X, Shopify, all routed through the same fabric.

[00:01:21]Subscribe. I break down one big system every week. Comment where you were during the last big outage.