Guides

Making network problems clear.

Every guide comes with a tool you can use to verify it yourself.

  1. 2026-10-17Native IP vs. Broadcast IP: Differences, How to Tell, and Common Misconceptions

    What native IPs and broadcast IPs are, how websites tell them apart, how to check for yourself using RDAP registration data and geolocation, and why "native" doesn't mean "clean."

  2. 2026-10-17DNS leaks and WebRTC leaks: how they work, how to check, and how to fix them

    Why can websites still see your real location with a proxy on? Explains how DNS leaks and WebRTC leaks work, shows how to check in your browser, and suggests fixes for common clients.

  3. 2026-10-17What Is Split Routing: Why Different Websites See You in Different Countries

    Explains how proxy split tunneling works, why ChatGPT, Claude, and Chinese websites see different exit IPs, and how to use the multi-exit check to see your own routing rules clearly.

  4. 2026-10-17Calling AI Model APIs from Mainland China: Latency, Reachability, and Choices

    Based on cdnping measurements, this explains the connectivity differences and latency sources when accessing APIs such as OpenAI, Claude, and Gemini versus DeepSeek, Kimi, and Zhipu from mainland China, and which metrics to look at when choosing.

  5. 2026-10-17Choosing a Public Frontend CDN for Projects in China: jsDelivr, unpkg, cdnjs, and Domestic Mirrors

    Compares how public CDNs such as jsDelivr, unpkg, cdnjs, npmmirror, BootCDN, and Staticfile perform in mainland China, with recommended production references and fallback setups.