Tracking · ONE
ONE tracking: how to track a container by its number
· 4 min read · Flettia team
If your container number starts with ONEU, it belongs to ONE. That number is all you need to know where it is going, when it arrives and which moves it has made, without opening the carrier's portal. This guide sums up what is specific to ONE: its prefixes, how it publishes its data and what to look for on the timeline.
Who ONE is and which prefixes it uses
ONE (Ocean Network Express) is the Japanese carrier formed in 2018 from the merger of NYK, MOL and K Line. Its containers carry the ONEU prefix, although on Latin American lanes it is common to see boxes from other owners loaded on its services.
ONE container prefixes: ONEU. The four letters are the owner code registered with the BIC; that is why the tracker infers the carrier without you choosing it.
ONE container tracking in three steps
- Go to tracker.flettia.com and type the full number: four letters and seven digits. If the check digit doesn't add up, it warns you before searching.
- The tracker recognises the ONE prefix and queries its data.
- You see the route on the map, the current status, the estimated or actual arrival date at the final port and the timeline with normalised milestones: loaded on board, departure, arrival, discharge and gate out.
How ONE publishes its data
- ONE publishes the container's full plan: the milestones already completed and the estimates for what remains, marked as estimated.
- ONE identifies locations with UN/LOCODE and describes the equipment in text (for example “40'DRY HC”). The tracker translates the code into a port and shows the type as the carrier publishes it.
- Because they are the carrier's estimates, future milestones can move; compare the final arrival date with the one you had at booking.
What to watch
Two dates matter more than the rest: discharge at the destination port, where free days usually start counting, and gate out, which confirms the container is on a truck. Seeing them the day they happen lets you schedule pickup before demurrage runs. Exact free time depends on your contract with the carrier and on the port.
Estimated dates are published by the carrier and can change with the vessel schedule. The tracker shows the latest one published; it does not promise it will hold.
Frequently asked questions
Is ONEY a container prefix?
No. ONEY is the code ONE uses on its shipping documents; ONE's own containers carry ONEU.
Can I see the future milestones of a ONE container?
Yes. ONE publishes the full estimated plan and the tracker shows it on the same timeline, marked as estimated.
Can I track with the BL or booking number?
Not today. The tracker searches by container number; the BL lists the container numbers in the “Container No.” field.
Track your ONE container now
Your first search is free, no sign-up. Type the number and we tell you where it is going: route on a map, status, arrival date and every move.