Standard Desktop/MicroATX (dependent on specific OEM variant). 2. Technical Specifications

: Search for a small barcode label on the board with a number like AA XXXXXX-XXX . This is the most reliable way to identify an Intel board. Check the Model Name

Use the Intel Product Specifications (ARK) tool to enter the AA number or a model name like "DH61WW" or "DH61HO" often found near the CPU socket.

Modern legacy Intel boards usually have the model name printed directly on the board in large, white, bold text. Look near the primary PCI Express x16 slot or between the processor socket and the RAM channels. Examples of true model names include: Intel Desktop Board DG41TY Intel Desktop Board D865PERL 2. Locate the "AA" Number (Altered Assembly)

Often features PCI Express 2.0 x16 slots for dedicated graphics cards. How to Find Your Exact Specification Link

Ensure you are using Windows 7 or 10, as earlier boards might not have Windows 11 drivers. Conclusion

The Intel Desktop Board D21B6 (also marketed as D21E1 / D21E2 variants) is a compact, socketed motherboard series designed for small-form-factor desktop and embedded systems. It blends stable Intel chipset features with legacy I/O support, making it useful for industrial, thin-client, kiosk, and home-office builds that need long-term availability and reliable onboard interfaces.

Intel Desktop Board Regulatory Marking Information : Explains why markings like "21 B6 E1 E2" cannot be used for identification .