The global tracking-number recognizer matches number structure against UPU S10 international postal identifiers and implemented rules for UPS, FedEx, USPS, DHL Express, SF Express, JD Logistics, YTO, J&T, Deppon, ZTO, STO and Yunda.

It performs classification locally and does not fetch shipment events in the background. After recognition, you can explicitly open the carrier's official page. UPU S10 postal identifiers can use UPU Global Track & Trace.

1. 01Enter an 8–34 character alphanumeric tracking number; spaces and hyphens may remain.
2. 02Review carrier or postal candidates ranked by structural evidence.
3. 03Characteristic prefixes are generally stronger than numeric length alone; use sender context when several candidates overlap.
4. 04Open official tracking only when you need live shipment events.

Live shipment data is normally served by carrier websites or authenticated APIs. Long-lived API credentials cannot safely be embedded in a public browser application, so Toolun keeps stable number-pattern recognition local and hands live tracking back to official services.

The Chinese UI may offer an additional China-focused aggregator shortcut, but that optional action is not a dependency of the global recognizer.

• Numbering rules change, and numeric-only commercial formats overlap frequently.
• A format match does not prove a shipment exists, was accepted, is still in transit or belongs to a particular person.
• UPU S10 trackability depends on the participating postal operators and service.
• The current rule table is not an exhaustive database of every carrier; new carriers can be added to the shared tracking detector.

• Identify a likely carrier when you only have a tracking number.
• Distinguish UPU S10 identifiers from commercial carrier formats in cross-border order data.
• Move from the universal recognizer to the specialized tracking page.
• Add more global carriers through the same candidate/confidence interface.

Local recognition does not upload the tracking number. If you open an external tracking page, the number is sent to the selected carrier, UPU or user-chosen aggregator. Tracking numbers can be linked to names, addresses and phone numbers, so do not publish complete numbers or verification details.