Which version of the .NET Framework is IIS using for my AppPool?

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The AppPool’s .NET CLR Version is different from the .NET Framework Version.

The .NET CLR Version 4.0 is the CLR base for the following .NET Framework Versions:

  • 4
  • 4.5 (including 4.5.1 and 4.5.2)
  • 4.6 (including 4.6.1 and 4.6.2 Preview)

So having a .NET CLR Version of 4.0 just means you support the above Frameworks, which will run under their deployed framework version.

Source: https://learn.microsoft.com/en-us/dotnet/standard/clr#clr-versions

Update Feb 2020:

Here is a full mapping of CLR to .NET Framework versions, based off this official documentation.
https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/versions-and-dependencies#version-information

CLR 1.0

.NET Framework 1.0

CLR 1.1

.NET Framework 1.1

CLR 2.0

.NET Framework 2.0

.NET Framework 3.0

.NET Framework 3.5

CLR 4

.NET Framework 4

.NET Framework 4.5

.NET Framework 4.5.1

.NET Framework 4.5.2

.NET Framework 4.6

.NET Framework 4.6.1

.NET Framework 4.6.2

.NET Framework 4.7

.NET Framework 4.7.1

.NET Framework 4.7.2

.NET Framework 4.8

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