Imperva

Imperva (Incapsula) is an application security / WAF provider. It publishes a JSON API of integration and edge IP ranges for allowlisting Imperva traffic to origin servers.

Autonomous systems

AS19551
Zscaler Zscaler hub IP ranges JSON. F5 Distributed Cloud F5 XC network allowlist JSON. Cloudflare Cloudflare edge IP lists (also used for WAF).