hyperion-cs/dpi-checkers

DPI Checkers is a tool that tests your internet connection for deep packet inspection censorship and identifies the specific blocking methods your ISP or data center provider uses.

The tool addresses the problem of detecting whether an internet service provider employs DPI technology to censor or restrict access. It works by running various network tests that probe for specific censorship techniques and their parameters. The primary offering is DPI-CH, a comprehensive checker written in Go that runs on Windows, macOS, Linux, and Android with flexible configuration options. The repository also includes TCP 16-20, a browser-based checker that detects a specific Russian blocking method by testing connections to provider-hosted services and checking host availability, with configurable timeout and custom endpoint parameters.

DPI Checkers suits researchers, network administrators, and users in regions with known ISP-level censorship who need to understand what blocking methods affect their connection. The comprehensive checker is not limited by browser sandboxing, making it suitable for detailed analysis beyond what web-based tools can accomplish. The TCP 16-20 checker is designed specifically for detecting Russian blocking methods and runs entirely in the browser without requiring VPN to be disabled, though the comprehensive checker is the more general-purpose tool for broader DPI analysis.

The maintainers respond to new issues and pull requests within a day.