Building a 500K req/s IP Geolocation Service: Radix Trees, .NET 10, and the Pursuit of Sub-5ms Latency
Story behind this blog post A couple of months ago, a friend of mine approached me with a challenging problem: building a service that can identify Iranian ISPs from IP addresses at an extreme scale. The requirements were brutal: around 500,000 requests per second with a P99 latency of under 5 milliseconds. As a reference for the data load, Iran has about 10,000,000 (Ten Million) IPs allocated across roughly 50,000 CIDR ranges, and the system was gonna be in the hot path of a very high-load environment. ...
