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> The top networks included the German provider Hetzner Online GmbH (Autonomous System Number 24940), Azteca Comunicaciones Colombia (ASN 262186), OVH in France (ASN 16276), as well as other cloud providers.

It's interesting that Cloudflare is doing public shaming here. That's a good thing in this case, isn't it?

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If I had to guess, they notified the networks in question and either received no reply, invalid reply(f*@k off) or received a reply but no corrective action.

It looks like the "other cloud providers" corrected their problems, or something. Since Cloudflare was able to generate a usable signature, they could have used it in their routers to blackhole the traffic. Guessing here... It's been years (late 90's/early 2000's) since I've had to deal with enterprise networking.

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