How large of a DDoS attack can Cloudflare handle?

Cloudflare's DDoS protection is effective for any attack size and any type of attack (Layer3/4, Layer 7 or DNS). We have no attack cap size and we do not charge overage fees. Common attack size range from 10Gbps to 65Gbps. However, we have seen larger attacks. For example, we had a customer that received an attack that was 500Gbps. This is highly uncommon and was reported as the largest DDoS in history - Cloudflare mitigated the attack for our customer. You can read about various case studies here:

How to Launch a 65Gbps DDoS, and How to Stop One
Ceasefires Don't End Cyberwars
The DDoS That Almost Broke the Internet

The Cloudflare Network is designed to mitigate DDoS attacks in a variety of ways. You can see a full detailed explanation here.

Other resources:
I'm Under Attack, What do I do?
Which plans include DDoS protection?

Still not finding what you need?

The Cloudflare team is here to help. 95% of questions can be answered using the search tool, but if you can’t find what you need, submit a support request.

Powered by Zendesk