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Description of the Subkeys Contained in the HKEY_LOCAL_MACHINE\Enum Registry Key

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This article was previously published under Q310592
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This article describes the subkeys contained in the HKEY_LOCAL_MACHINE\Enum registry key in Windows.
The HKEY_LOCAL_MACHINE\Enum key contains subkeys for the specific hardware components your computer uses. Windows uses this information to allocate resources (for example, IO addresses and interrupts for the devices). All values in the Enum subkey are manufacturer-specific and device-specific, so specific information can vary from computer to computer.

Entries in the Enum Subkey


This subkey contains entries for Plug and Play components of the BIOS (this includes timers, controllers, and direct memory access [DMA] chips). Each BIOS subkey starts with the string *PNP and is followed by a four-digit number that represents classes by which the components are grouped, as shown in the following example:
Each *PNPxxxx key contains subkeys (00,01) that contain the data (for example, class name, device description string, driver name, and hardware ID) for the device configuration.


This subkey contains the configuration data of the IDE-controller used for hard disks and other devices.


This subkey contains the configuration data of the floppy disk controllers used in the computer.


This subkey is reserved for future use in Windows.


This subkey contains entries for Plug and Play equipment enumerated on an ISA bus.


This subkey defines manufacturer-specific information about hardware components.


This subkey contains information about the monitor used in the computer. If Setup cannot detect the monitor type, the user sets the selection.


This subkey contains information about the network (for example, redirectors, services, and NetBEUI). The network adapter is specified in the Root\Net subkey.


This subkey contains entries for Plug and Play equipment on a Peripheral Component Interconnect (PCI) bus.


This subkey contains *PNPxxxx entries for legacy, non-Plug and Play hardware (for example, the CPU, BIOS, network adapters, and printer drivers).


This subkey contains information data for Small Computer System Interface (SCSI) devices.


This subkey contains information data for Universal Serial Bus (USB) devices. USB support is not included in Windows 95.

NOTE: Depending on the computer, you may have have keys for infrared, tape controllers, and modems, if those devices are installed on the system.
registry regedit hardware enumeration pnp

Article ID: 310592 - Last Review: 12/07/2015 08:02:14 - Revision: 1.5

Microsoft Windows XP Home Edition, Microsoft Windows XP Professional, Microsoft Windows XP Professional x64 Edition

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