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The 51Degrees .NET Detector is designed to be quick to deploy for even low skill developers, and provide fast, accurate and consistent results for both real time device detection within web sites and offline analysis. All the source code and 51Degrees free Lite data is licenced under the Mozilla Public Licence version 2.

The Detection solution is a single project for .NET 4.0 and up, distributed as C# source code and as a DLL. .NET 3.5 is no longer supported (if you require support for .NET 3.5 please contact us at

The following pages explain where to download official distributions, initial deployment, obtaining updates to device data before covering more advanced features such as logging and advanced redirection methods.