5 prefixes · leasing company
Triton International container prefixes
TRLU, TCLU, TCNU, TCKU and TTNU are registered to Triton International, a container leasing company. Triton International owns the box and does not carry it: track it with the shipping line named on your booking or bill of lading, because that line holds the record of where it is. The check digit is worked out below for each prefix.
Triton International is the world’s largest container lessor — roughly seven million TEU of boxes that it owns but never sails, renting them to nearly every major line.
Five codes mark Triton steel, and seeing one tells you who owns the box — never who is moving it.
4 letters + 7 digits, printed on the doors. It is on your bill of lading too.
The answer appears as you type. Nothing is sent anywhere.
All 5 Triton International prefixes
| Prefix | A valid number | Check digit | Where the code comes from |
|---|---|---|---|
TRLU | TRLU 755248-3 | 3 | — |
TCLU | TCLU 456058-9 | 9 | — |
TCNU | TCNU 515896-7 | 7 | — |
TCKU | TCKU 426139-0 | 0 | TCKU is commonly misattributed to Maersk by tracking aggregators; the BIC register says Triton, a lessor. |
TTNU | TTNU 854978-3 | 3 | — |
Prefix register verified against two independent sources on 2026-08-03. The example numbers are computed to show the arithmetic. They are valid by construction, not numbers we saw on a box.
Data: BIC Container Prefix Register · ISO 6346:2022
TRLU: check digit, worked through
TRLU is registered to Triton International. Take TRLU 755248-3: each of its first ten characters has a value and a weight, the products are added, and the remainder after dividing by 11 is the check digit — here 3.
| Character | Value | Weight | Product |
|---|---|---|---|
T | 31 | ×1 | 31 |
R | 29 | ×2 | 58 |
L | 23 | ×4 | 92 |
U | 32 | ×8 | 256 |
7 | 7 | ×16 | 112 |
5 | 5 | ×32 | 160 |
5 | 5 | ×64 | 320 |
2 | 2 | ×128 | 256 |
4 | 4 | ×256 | 1024 |
8 | 8 | ×512 | 4096 |
Sum 6405 → 6405 mod 11 = 3 → check digit 3 → TRLU 755248-3
TCLU: check digit, worked through
TCLU is registered to Triton International. Take TCLU 456058-9: each of its first ten characters has a value and a weight, the products are added, and the remainder after dividing by 11 is the check digit — here 9.
| Character | Value | Weight | Product |
|---|---|---|---|
T | 31 | ×1 | 31 |
C | 13 | ×2 | 26 |
L | 23 | ×4 | 92 |
U | 32 | ×8 | 256 |
4 | 4 | ×16 | 64 |
5 | 5 | ×32 | 160 |
6 | 6 | ×64 | 384 |
0 | 0 | ×128 | 0 |
5 | 5 | ×256 | 1280 |
8 | 8 | ×512 | 4096 |
Sum 6389 → 6389 mod 11 = 9 → check digit 9 → TCLU 456058-9
TCNU: check digit, worked through
TCNU is registered to Triton International. Take TCNU 515896-7: each of its first ten characters has a value and a weight, the products are added, and the remainder after dividing by 11 is the check digit — here 7.
| Character | Value | Weight | Product |
|---|---|---|---|
T | 31 | ×1 | 31 |
C | 13 | ×2 | 26 |
N | 25 | ×4 | 100 |
U | 32 | ×8 | 256 |
5 | 5 | ×16 | 80 |
1 | 1 | ×32 | 32 |
5 | 5 | ×64 | 320 |
8 | 8 | ×128 | 1024 |
9 | 9 | ×256 | 2304 |
6 | 6 | ×512 | 3072 |
Sum 7245 → 7245 mod 11 = 7 → check digit 7 → TCNU 515896-7
TCKU: check digit, worked through
TCKU is registered to Triton International. Take TCKU 426139-0: each of its first ten characters has a value and a weight, the products are added, and the remainder after dividing by 11 is the check digit — here 0.
TCKU is commonly misattributed to Maersk by tracking aggregators; the BIC register says Triton, a lessor.
| Character | Value | Weight | Product |
|---|---|---|---|
T | 31 | ×1 | 31 |
C | 13 | ×2 | 26 |
K | 21 | ×4 | 84 |
U | 32 | ×8 | 256 |
4 | 4 | ×16 | 64 |
2 | 2 | ×32 | 64 |
6 | 6 | ×64 | 384 |
1 | 1 | ×128 | 128 |
3 | 3 | ×256 | 768 |
9 | 9 | ×512 | 4608 |
Sum 6413 → 6413 mod 11 = 0 → check digit 0 → TCKU 426139-0
TTNU: check digit, worked through
TTNU is registered to Triton International. Take TTNU 854978-3: each of its first ten characters has a value and a weight, the products are added, and the remainder after dividing by 11 is the check digit — here 3.
| Character | Value | Weight | Product |
|---|---|---|---|
T | 31 | ×1 | 31 |
T | 31 | ×2 | 62 |
N | 25 | ×4 | 100 |
U | 32 | ×8 | 256 |
8 | 8 | ×16 | 128 |
5 | 5 | ×32 | 160 |
4 | 4 | ×64 | 256 |
9 | 9 | ×128 | 1152 |
7 | 7 | ×256 | 1792 |
8 | 8 | ×512 | 4096 |
Sum 8033 → 8033 mod 11 = 3 → check digit 3 → TTNU 854978-3
Owner and operator: who tracks a Triton International box
A Triton-prefixed box in your booking means the line rented it that week; Triton’s own systems hold no voyage data at all.
Can you see where the ship is?
Not from the container. A standard dry box has no power, no radio and no satellite receiver — it is a steel case with a number painted on it, and it reports nothing about itself. Every position you see against a Triton International shipment was reported by something else: a terminal crane, a gate reader, or the ship.
A live map on a carrier’s tracking page is almost always plotting AIS, the transponder every large vessel broadcasts with its position, course and speed. That is genuinely useful at sea: it is a real position rather than a schedule, and an ETA recalculated from actual movement. It is also the ship’s position, not your box’s, and the two part company the moment the container is discharged.
On land the map goes quiet. Between the gate-out and the delivery there is no vessel to follow, and the road leg appears only as whatever events the terminal and the trucker report. A container sitting on a chassis in a yard shows the last position of a ship it left days ago. Only specialised IoT equipment reports its own location, and wherever that exists it is a paid product sold to the shipper, not something a tracking page gives away.
Frequently asked questions
Who owns TRLU, TCLU and TCNU containers?
Triton International does, a container leasing company — the BIC register lists 5 owner prefixes under it: TRLU, TCLU, TCNU, TCKU and TTNU, and the boxes sail in other lines' fleets.
How do I track a TRLU container?
Not with Triton International — a TRLU box is leased, so the record of its journey is with the shipping line named on your booking confirmation or bill of lading. Open that line's tracker and paste the number there.
Why does Triton International have 5 prefixes?
Because one prefix holds only a million serial numbers, and a lessor that merges with another keeps the codes already painted on the boxes. All 5 belong to the same company.
Is TRLU a shipping line prefix or a leasing prefix?
A leasing prefix — Triton International owns the steel box while a shipping line operates it, which is why the owner and the tracker are different companies.
Is TRLU7552483 a valid container number?
Yes — TRLU 755248-3 passes the ISO 6346 check: the weighted sum for TRLU755248 leaves a remainder of 3 when divided by 11, which gives check digit 3. It is an example computed for this page, not a box we have seen.
Is TCKU a Maersk container prefix?
No — TCKU belongs to Triton International, a leasing company; aggregator sites that label TCKU as Maersk are repeating an old error, so track with the line on your booking.
One page, every owner code
Know whose box it is before you search
All 85 owner prefixes mapped to their line or leasing company, with the leased ones marked — so you can tell at a glance when to track with the line instead. Container dimensions are on page two.
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