The Secret of Global Package Tracking Numbers: Unveiling the S10 Standard
2025-06-14
Ever wondered how international package tracking numbers work? This article unveils the S10 standard, a 13-character code developed by the Universal Postal Union (UPU). This standard includes service indicators, serial numbers, check digits, and country codes. It also specifies barcode formats and font requirements. The S10 standard ensures interoperability across global postal systems and provides reliable package tracking.