Specifying the carrier when registering a tracking number can significantly improve both the success rate and accuracy of the query results. It is recommended to confirm the actual carrier with the sender for accurate queries.
If the carrier for a tracking number is unknown, the carrier code can be left empty during registration. The 17TRACK system will automatically identify the carrier and perform the query.
*Automatic identification generally works better for postal-type tracking numbers, e.g., China Post. For purely numeric tracking numbers, which may lack specific rules or have overlapping rules across carriers, results may be less accurate, potentially leading to issues with carrier recognition or incorrect carrier matches.