37-bit Card Format

One of the most common 37-bit formats is HID Corporate 1000 Format (Format #26), widely used in enterprise access control systems. It provides a significantly larger number range and stronger credential management than 26- or 34-bit formats.

ComponentBit CountBit PositionDetailsExample
Reserved1 bit1Often unused or set to 0
Company Code12 bits2 to 13Unique to the organization (0–4095)
Card Number24 bits14 to 37Unique card ID (0–16,777,215)