Tracking numbers starting with ZS: it's China EMS line-haul
ZS then eleven digits. A China EMS-labelled line-haul number. It usually converts to a local postal number on arrival; the agent's parcel page shows the new one.
Track it
The number never appears in a link or page address.
Other formats
Questions people ask
What carrier is a tracking number starting with ZS?
China EMS line-haul. A China EMS-labelled line-haul number. It usually converts to a local postal number on arrival; the agent's parcel page shows the new one.
Where do I track it?
The RepTools tracker. The carrier's own portal for these is locked behind a captcha.
My ZS number stopped updating. Is the parcel lost?
Usually it has simply converted: these line-haul numbers hand over to a local postal number when the parcel lands, and your agent's parcel page shows the new one. Track that number for the last mile.
Why does my tracking number show nothing?
Because the number was created before the parcel left China. Local carriers like Canada Post, USPS and Royal Mail only scan once the parcel lands in your country, usually 4 to 10 days after your agent ships. The RepTools tracker fills that gap with the agent's own China-side scans.
Counts are tracking numbers looked up on rep.tools in the last 45 days, grouped by format, updated 2026-09-05. Carrier attribution comes from the format itself plus the carrier that scanned the parcel. Delivery times are measured from the first carrier scan to the delivery scan.