How to track Chunghwa Post (`...TW`) EMS, Air Parcel & ePacket shipments handed off to USPS

Chunghwa Post (中華郵政 / Taiwan Post) flies EMS (`EE...TW` / `EB...TW`), International Air Parcels (`CC...TW`), and ePackets (`LK...TW` / `RA...TW`) from Taipei Taoyuan (`TPE`) to US ISC gateways (`SFO`, `LAX`, `JFK`, `ORD`) where USPS takes over final delivery.

Try a live tracking number:

Barcode transition: Chunghwa Post (Taiwan Post) to USPS

Domestic Chunghwa Post (Taiwan Post) parcels keep the same 92… / 420… barcode from pickup to mailbox. Pass ?carrier=chunghwapost to inspect middle-mile sort scans before USPS induction.

Origin / middle-mile carrier
Chunghwa Post (Taiwan Post) (chunghwapost)
UPU S10 Taiwan Barcode
EE / LK / RA / CC + 9 digits + TW
Origin example
EE849201948TW
Final-mile carrier
USPS (usps)
Same S10 Barcode on USPS
EE / LK / RA / CC + 9 digits + TW
Final-mile example
EE849201948TW
Middle-mile resolution
EE849201948TW

How the Chunghwa Post → USPS handoff works

Follow the parcel across both networks without waiting on asynchronous webhooks or losing visibility at the handoff boundary.

1. Acceptance & Taipei Exchange Office Dispatch
Chunghwa Post accepts the parcel in Taiwan and dispatches it from the Taipei International Mail Processing Center at Taoyuan Airport (`TPE`).
2. Arrival at US ISC Gateway & CBP Customs
The airmail dispatch arrives at `ISC SAN FRANCISCO (USPS)`, `ISC LOS ANGELES CA (USPS)`, or `ISC NEW YORK NY (USPS)` and clears US Customs and Border Protection.
3. USPS Domestic Final Delivery
USPS delivers the item under the exact same `...TW` S10 barcode via Priority Mail Express (for `E...TW`), Priority Mail (`C...TW`), or Ground Advantage (`L...TW` / `R...TW`).
Origin Postal Operator
`chunghwapost` (Chunghwa Post Co., Ltd. — Taiwan)
US Final Mile
`usps` (United States Postal Service)
Barcode Preservation
13-character UPU S10 (`...TW`) tracks across both Chunghwa Post and USPS.

Chain Chunghwa Post → USPS in code or MCP

Resolve both legs synchronously in TypeScript, curl, or your AI support agent via Streamable HTTP MCP.

REST (Synchronous GET)

# 1. Query Chunghwa Post (Taiwan Post) middle-mile scans on the 92… barcode:
curl "https://api.lastscanned.com/v1/track/EE849201948TW?carrier=chunghwapost" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

# 2. Query USPS final-mile scans on the same barcode:
curl "https://api.lastscanned.com/v1/track/EE849201948TW" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

TypeScript (Automatic Handoff Chaining)

const headers = { Authorization: `Bearer ${process.env.LASTSCANNED_API_KEY}` };
const res = await fetch(`https://api.lastscanned.com/v1/track/${encodeURIComponent(number)}`, { headers });
let pkg = await res.json();

// If USPS is still waiting on the consolidator parcel, query Chunghwa Post (Taiwan Post) middle-mile hubs:
if (pkg.carrier === "usps" && pkg.status === "label_created" && /^(420\d{5})?9[2345]/.test(number)) {
  const mid = await fetch(`https://api.lastscanned.com/v1/track/${encodeURIComponent(number)}?carrier=chunghwapost`, { headers });
  if (mid.ok) pkg = await mid.json();
}

Remote MCP (Claude Code / Cursor / ChatGPT)

claude mcp add --transport http lastscanned https://mcp.lastscanned.com \
  --header "Authorization: Bearer lsk_live_YOUR_API_KEY"

Chunghwa Post (Taiwan Post) EMS & ePacket to USPS Handoff FAQ

Does a Chunghwa Post (...TW) tracking number change when it reaches USPS?
No. International EMS (`EE...TW`), Air Parcel (`CC...TW`), ePacket (`LK...TW`), and Registered Air Mail (`RA...TW`) keep the same 13-character `...TW` tracking number all the way to your US mailbox.
Why does USPS stopped updating Registered Mail (`RA...TW`) from Taiwan?
Unlike EMS (`EE...TW`) and ePacket (`LK...TW`), standard Registered Letter Post (`R...TW`) is not always scanned on public USPS web tracking after arriving in the US; upgrade to ePacket (`LK...TW`) or EMS for full door-to-door USPS scans.
How long does Chunghwa Post EMS take from Taiwan to the US?
Chunghwa Post EMS typically delivers to the US West Coast in 3 to 6 business days and to the East Coast in 5 to 8 business days.

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