An S10 identifier has 13 characters. The final country code identifies the issuing authority, while destination routing and customs information are separate.
Explicación del campo · 01
Service indicator · positions 1–2
En este ejemplo: R / RT
Campo documentado / ejemplo de datos
RTRT falls within the documented RA–RZ registered letter-post indicator range.
Comprobar antes de usar
The indicator describes a postal product family, not a universal delivery-time commitment. RZ requires bilateral agreement.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 02
Serial number · positions 3–10
En este ejemplo: RT011231107HK
Campo documentado / ejemplo de datos
01123110The serial number occupies eight numeric positions inside the complete identifier.
Comprobar antes de usar
The serial alone is not the complete 13-character tracking identifier.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 03
Check digit · position 11
Campo documentado / ejemplo de datos
7Position 11 is the S10 check digit.
Comprobar antes de usar
A valid check digit verifies identifier structure, not shipment acceptance, ownership or delivery.
Referencia oficial: Identification of postal items – 13-character identifier · upu standards
↑ Volver al índice de camposExplicación del campo · 04
Issuing-authority country · positions 12–13
En este ejemplo: HK
Campo documentado / ejemplo de datos
HKThe suffix is the ISO country code under whose authority the identifier was issued.
Comprobar antes de usar
It is not a destination-country routing field; read the destination address separately.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 05
Account information
Campo documentado / ejemplo de datos
[NOT ENCODED IN S10 STRUCTURE]The four S10 components do not include a billing-account field.
Comprobar antes de usar
Verify postage and customer-account information elsewhere in the postal shipment record.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 06
Customs declaration
En este ejemplo: CN22
Campo documentado / ejemplo de datos
CN22 · CD · HKD50.00This specimen integrates a CN22 customs declaration with the registered-item label. Reconcile the category, contents, weight, declared value and signature with the shipment record.
Comprobar antes de usar
The S10 format alone does not establish contents, declared value or customs clearance.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 07
Signature instruction
En este ejemplo: Signature required
Campo documentado / ejemplo de datos
Signature requiredThe CN04 area includes an explicit signature-required instruction.
Comprobar antes de usar
The signature instruction is printed outside the 13-character S10 identifier. It does not prove a signature was collected, establish live delivery status or mean that the RT or HK components encode a signature result. Check the issued label and applicable service conditions.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 08
Additional non-S10 barcode
En este ejemplo: Additional non-S10 barcode
Campo documentado / ejemplo de datos
Additional non-S10 barcodeThe source explains that a second non-S10 barcode can coexist with the S10 identifier. It must not be mistaken for a second S10 tracking number.
Comprobar antes de usar
The additional barcode is not a second S10 tracking identifier. Its presence alone does not establish a decoded payload, account, service code or accepted live shipment. Do not substitute it for RT011231107HK without documentation for that barcode and workflow.
Referencia oficial: Identification of postal items – 13-character identifier
↑ Volver al índice de camposExplicación del campo · 09
Actual destination
En este ejemplo: Melville SK S0A 2P0 CANADA
Campo documentado / ejemplo de datos
Melville SK S0A 2P0 CANADAThe destination address supplies routing context. The HK suffix in the S10 number identifies the issuing authority.
Comprobar antes de usar
Canada is the destination in this illustrated address; HK in the S10 identifier is the issuing authority. The address does not establish an internal depot or route token, actual transport mode, current booking or shipment status. Preserve the source redactions rather than reconstructing masked address details.
Referencia oficial: Identification of postal items – 13-character identifier
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