Dot Net Framework Specific Build Target

.NET Framework Specific Build Target

Version number	CLR version	Development tool	Included in		Replaces
			Windows	Windows Server
1	1	Visual Studio .NET	XP	N/A	N/A
1.1	1.1	Visual Studio .NET 2003	N/A	2003	1
2	2	Visual Studio 2005	N/A	2003, 2003 R2, 2008 SP2, 2008 R2 SP1	N/A
3	2	Expression Blend	Vista	2008 SP2, 2008 R2 SP1	2
3.5	2	Visual Studio 2008	7, 8, 8.1, 10	2008 R2 SP1	2.0, 3.0
4	4	Visual Studio 2010	N/A	N/A	N/A
4.5	4	Visual Studio 2012	8	2012	4
4.5.1	4	Visual Studio 2013	8.1	2012 R2	4.0, 4.5
4.5.2	4	N/A	N/A	N/A	4.0–4.5.1
4.6	4	Visual Studio 2015	10	N/A	4.0–4.5.2
4.6.1	4	Visual Studio 2015 Update 1	10 v1511	N/A	4.0–4.6
4.6.2	4		10 v1607	2016	4.0–4.6.1
4.7	4	Visual Studio 2017	10 v1703	N/A	4.0–4.6.2

Reference:
wikipedia