Determining Internet Explorer Bitness: 32-bit or 64-bit

Method #1:
Put the call in the IE console: (F12 to open)

> alert(window.navigator.cpuClass);

Method #2:
javascript: alert(window.navigator.cpuClass);


N.B.: Didn't work for my IE 11.0.9600



Result:

x86 --> You are using 32-bit of Internet Explorer
x64 --> You are using 64-bit of Internet Explorer