Cloud providers today publish the IP ranges of their servers. This is useful data for stopping malicious traffic to your Phoenix app. Learn how to classify incoming requests using persistent_term, radix trees, and a simple plug. This talk will cover: 1. A brief description of how bots cause problems in Phoenix apps, showing why someone would want to classify requests as coming from a bot. 2. The design of a plug to compare each incoming request's IP against a radix tree of public cloud provider IP ranges. 3. Why persistent_term is better than ETS for this task 4. How to use this plug to prevent bot attacks in your Phoenix app This talk is based on the blog post - https://paraxial.io/blog/cloud-ips