| Bar Codes / Bar Code type details | |
Details on the Intelligent Mail bar code type.
Intelligent Mail is a United States postal service bar code for usage with the USPS mail stream. It is also known as the USPS OneCode Solution or USPS 4-State Customer Barcode. Valid abbreviations for this bar code type include 4CB, 4-CB, and USPS4CB.
The bar code encodes up to 31 digits. The code value is expected as two comma-separated fields. Each field consists solely of digits. The first field contains the tracking code. The second field contains the routing code.
| Type | Field | Digits |
|---|---|---|
| Tracking code field | Barcode Identifier | 2 digits; 2nd digit must be 0-4. |
| Tracking code field | Service Type Identifier | 3 digits. |
| Tracking code field | Mailer Identifier | 6 or 9 digits. |
| Tracking code field | Serial Number | 9 digits, when used with a 6-digit Mailer Identifier. 6 digits, when used with a 9-digit Mailer Identifier. |
| Routing code field | Delivery Point ZIP Code | 0, 5, 9, or 11 digits. |