On September 17, 2024, during planned routine maintenance, Cloudflare stopped announcing 15 IPv4 prefixes, affecting some Business plan websites for approximately one hour. During this time, IPv4 traffic for these customers would not have reached Cloudflare and users attempting to connect to websites using addresses within those prefixes would have received errors.

Cloudflare's platform is a leading provider of internet security and performance solutions, offering insights into web security, content delivery, and DNS management. Through documentation, blog posts, and webinars, Cloudflare provides insights into protecting websites and applications from cyber threats and improving performance. Developers and IT professionals can learn about CDN (Content Delivery Network), DDoS mitigation, and firewall configurations to secure and accelerate web traffic.

Cloudflare

On September 17, 2024, Cloudflare experienced an outage affecting some Business plan websites due to an internal software error in handling IPv4 prefixes. The Addressing team's routine maintenance inadvertently stopped announcing fifteen IPv4 prefixes, leading to traffic issues. The error stemmed from an assumption that all websites had been renumbered, which was incorrect. The issue was quickly identified and rolled back, restoring normal traffic. Cloudflare has since implemented several measures to prevent similar incidents in the future.

Cloudflare incident on September 17, 2024

What are we doing to prevent this from happening again?