UWL container tracking

How to read an UWL container number

UWLJ1051107 example only — not a real shipment

Container numbers follow ISO 6346, the international standard for freight-container identification: four letters, six serial digits, then one check digit. The first three letters are the owner code — registered with the BIC (Bureau International des Containers) — and the fourth letter is the equipment category (U for a standard freight container).

Take UWLJ1051107 as an UWL-style example: UWLJ is the registered prefix (owner code UWL plus the category letter J), 105110 is the serial, and the final 7 is the check digit computed from the ten characters before it — tracking systems use it to catch typos before they search.

If your UWL tracking isn’t working

1. 1 Check the number format first

   Container numbers are exactly four letters plus seven digits (like UWLJ1051107). A common slip is confusing the letter O with zero, or dropping the final check digit. Copy the number from the door of the container or your booking confirmation rather than retyping it.

2. 2 Make sure the number was issued by this carrier

   If your shipment was booked through a freight forwarder, the number on your paperwork may be the forwarder’s own reference, which UWL’s system won’t recognise. Ask whoever issued your documents which carrier number to use — or paste the number on our homepage and we’ll work out who it belongs to.

3. 3 Too early or too late

   Timing matters: a number that was only just issued may not show results yet, and carriers remove old shipments from public tracking a few weeks after delivery. If the shipment is very new or long delivered, an empty result doesn’t mean the number is wrong.

4. 4 Paste carefully on UWL’s page

   UWL asks you to type the number on its own page, so paste it exactly — no spaces before or after, and no extra characters picked up from an email. If the page shows a security check, complete it and search again.

5. 5 Still nothing?

   Contact whoever sold you the freight service (your forwarder, broker, or UWL directly) with the container number and the booking reference — they can see internal status that public tracking doesn’t show.

Frequently asked questions

How do I track an UWL container?

Type your container number in the box above and press Track. You’ll land on UWL’s own tracking page — paste your number there and search. UWL container numbers usually begin with UWLJ, UWLU, UWLZ.

What does an UWL container number look like?

Container numbers follow the ISO 6346 standard: four letters then seven digits (for example CSNU1234567). The first four letters identify the owner. For UWL the owner prefixes are typically one of UWLJ, UWLU, UWLZ. A format-valid example is UWLJ1051107.

Why does the UWL page open without my number filled in?

UWL asks everyone to enter the number on its own page (it has a security check), so it can’t be filled in ahead of time. We bring you to the right page — just paste your number there.

What if my number doesn’t start with UWLJ or UWLU?

Then it probably wasn’t issued by UWL — shipments booked through a freight forwarder or partner carrier often travel under another company’s container number. Paste the number on our homepage and we’ll suggest the right shipping line, or check your shipping paperwork for who issued it.

Is this UWL’s official tracking site?

No — this is a free, independent tool that brings every carrier’s tracking together in one place. When you track here you end up on UWL’s own page, so everything you see comes straight from UWL. We never see or store your shipment details.