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It is also known as the USPS OneCode Solution or USPS 4-State Customer Barcode (abbreviated 4CB, 4-CB, or
USPS4CB).
The Intelligent Mail® barcode (formally known as the 4-State Customer Barcode) is the next generation of USPS® barcode technology used to sort and track letters and flats. Intelligent Mail® barcode technology, among other things, combines the capabilities of the POSTNET barcode and the Planet Code® barcode into one unique barcode.
Intelligent Mail Barcode Data Fields – Table I shows payload data fields to be
encoded. The 20-digit tracking code shall consist of the Barcode Identifier, Service
Type Identifier, Mailer Identifier, and Serial Number fields in the order specified in Table
I. The routing code shall consist of the delivery point ZIP Code. The Intelligent Mail
barcode shall be capable of encoding up to 31 digits of data.
Table I. - Intelligent Mail Barcode Data Fields
| Type | Field | Digits |
| Tracking Code | Barcode Identifier | 2 (2nd digit must be 0–4) |
| Service Type Identifier | 3 |
| Mailer Identifier | 6 or 9 |
| Serial Number | 9 (when used with 6 digit Mailer ID) 6 (when used with 9 digit Mailer ID) |
| Routing Code | Delivery Point ZIP Code | 0, 5, 9, or 11 |
| | | Total 31 maximum |
Table II. Comparising Intelligent Mail vs. Existing symbologies
| Field | Intelligent Mail | Planet barcode | PostNet |
| Barcode ID | 2 | 0 | 0 |
| Servide type | 3 | 2 | 0 |
| Mailer ID | 6 or 9 | 5 | 0 |
| Serial Number | 9 or 6 | 6 | 0 |
| Delivery Point ZIP Code | none , 5, 9, 11 | 0 | 5,9, or 11 |
| Total digits | 31 digits | 13 digits | 11 digits |
Intelligent Mail Barcode - Examples :
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