Many legacy systems or third-party APIs require you to allowlist specific IP addresses to grant access. Using static IPs ensures your connection isn't blocked when Cloudflare’s shared pool rotates.
All traffic destined for a Cloudflare-protected website first hits those static IPs. Cloudflare can therefore apply strict rate-limiting, behavioral analysis, and packet inspection at the network edge before any traffic reaches the customer’s origin server. The static IP becomes a —a single, predictable door that is guarded by the world’s most sophisticated DDoS defense systems. When a massive attack occurs, the static IPs allow Cloudflare to absorb and disperse the traffic across its entire anycast fabric, scrubbing the attack at the network border. In this context, changing IPs would be a liability, giving attackers a moving target while forcing defenders to constantly update routing rules. cloudflare static ips