Simplify allowlist management and lock down origin access with Cloudflare Aegis
Mar 20, 2025Mia Malden, Adrien Vasseur
Summary
This post introduces Bring Your Own IPs (BYOIP) for Cloudflare Aegis, enabling customers to onboard entire IPv4 /24 prefixes or IPv6 /64 prefixes. It also announces a customer-accessible Aegis API and the gradual rollout of observability for Aegis IP utilization. The post details the technical aspects of Aegis, including its use of soft-unicasting, L4 XDP-based load balancer Unimog, and capacity constraints for both IPv4 (40k concurrent connections per Aegis IP per origin) and IPv6 traffic.
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