About.

Available API Set
.NET Standard 1.0 1.1 1.2 1.3 1.4 1.5 1.6 2.0
.NET Core 1.0 2.0
.NET Framework 4.5 4.5.1 4.6 4.6.1
Mono 4.6 5.4
Xamarin.iOS 10.0 10.14
Xamarin.Android 7.0 8.0
Universal Windows Platform 10.0 10.0.16299
Windows 8.0 8.1
Windows Phone 8.1
Windows Phone Silverlight 8.0