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.
| Component | Bit Count | Bit Position | Details | Example |
|---|---|---|---|---|
| Reserved | 1 bit | 1 | Often unused or set to 0 | |
| Company Code | 12 bits | 2 to 13 | Unique to the organization (0–4095) | |
| Card Number | 24 bits | 14 to 37 | Unique card ID (0–16,777,215) |
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