The UPU S10 standard defines a system for assigning 13-character identifiers to international postal items for the purpose of tracking and tracing them during shipping.
| Type | datatype | |
| Regular expression | ^[A-z]{2}\d{8}\d{1}[A-z]{2}$ | |
| Parent data type | tracknum | |
| Sources | ||
| Classification | Classification | identifier |
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