An IDA Pro plugin which decodes a Windows Device I/O control code into DeviceType, FunctionCode, AccessType and MethodType.

Copy the Python file in a /plugins directory to a (IDA)/plugins directory. It should be located like this:

C:\Program Files\IDA Pro x.x\plugins\WinIoCtlDecoder.py 

1. Select an interesting IOCTL code in the disassemble window.
2. Hit Ctrl+Alt+D or select Edit/Plugins/Windows IOCTL code decoder

You also can call 'winio_decode' function directly from the Python CLI window.

The result will be printed in the Output window.

Python>winio_decode(0x220086) winio_decode(0x00220086) Device : FILE_DEVICE_UNKNOWN (0x22) Function : 0x21 Method : METHOD_OUT_DIRECT (2) Access : FILE_ANY_ACCESS (0)