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--- title: Discover .NET Apps to Azure App Service description: Learn about .NET migration resources available to Azure App Service and about the capabilities of discovery. author: msangapu-msft ms.topic: concept-article ms.date: 11/17/2025 ms.author: msangapu ms.devlang: csharp ms.custom: devx-track-dotnet ms.service: azure-app-service #customer intent: As a deployment engineer, I want to learn about discovery resources and learn the capabilities of discovery so that I can get started with discovery. --- # At-scale discovery of .NET web apps For ASP.NET web apps discovery, you need to either install a new [Azure Migrate appliance](../migrate/migrate-appliance.md) or upgrade an existing one. Once the appliance is configured, Azure Migrate initiates the discovery of web apps deployed on Internet Information Services (IIS) web servers hosted within your on-premises VMware environment. ## Key capabilities of ASP.NET web app discovery - Agentless discovery of up to 20,000 web apps with a single Azure Migrate appliance - Rich and interactive dashboard that lists IIS web servers and underlying VM infra details. Web apps discovery surfaces information such as: - web app name - web server type and version - URLs - binding port - application pool - If web apps discovery fails, the discovery dashboard allows easy navigation to review relevant error messages, possible causes of failure, and suggested remediation actions ## Related content - [At scale discovery and assessment for ASP.NET app migration with Azure Migrate](/shows/inside-azure-for-it/at-scale-discovery-and-assessment-for-aspnet-app-migration-with-azure-migrate) - [Discover and assess ASP.NET apps at-scale with Azure Migrate](https://azure.microsoft.com/blog/discover-and-assess-aspnet-apps-atscale-with-azure-migrate/) - [Discover installed software inventory, web apps, and database instances](../migrate/how-to-discover-applications.md) - [Discover web apps and SQL Server instances in an existing project](../migrate/how-to-discover-sql-existing-project.md)