The string found on your Intel motherboard is not a specific model number, but a regulatory or industry specification marking often found on boards using the LGA 1155 socket . It is typically associated with Intel’s 2nd Generation (Sandy Bridge) and 3rd Generation (Ivy Bridge) Core processor desktop boards.
Look for a small barcode label on the board with a number starting with "AA" (e.g., AA G10212-201). This is the true identifier for Intel motherboards. intel desktop board 21 b6 e1 e2 specification link
to retrieve the official technical product specification (TPS). Check System Information : If the board is currently powered on, use the Microsoft System Information app to find the "BaseBoard Product" name. The string found on your Intel motherboard is
Intel Desktop Board 21-B6-E1-E2 w/ Intel i5-2300 4GB ... - eBay intel desktop board 21 b6 e1 e2 specification link