1 prefix · shipping line
CMCU container prefix: Crowley
Track on csight.crowley.com — official Crowley tracker
Full Crowley container tracking guide →
CMCU is the BIC owner prefix registered to Crowley. A container number that starts with it belongs to the Crowley fleet and is tracked free at csight.crowley.com. The eleventh character of the number is a check digit; it is worked out below for this prefix.
Crowley is the Florida-based Jones Act operator serving Puerto Rico, Central America and the Caribbean since 1892, as much a logistics group as a line.
One code covers its box pool, tracked through the csight.crowley.com portal.
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.
The Crowley prefix
| Prefix | A valid number | Check digit | Where the code comes from |
|---|---|---|---|
CMCU | CMCU 216706-0 | 0 | — |
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
CMCU: check digit, worked through
CMCU is registered to Crowley. Take CMCU 216706-0: 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.
| Character | Value | Weight | Product |
|---|---|---|---|
C | 13 | ×1 | 13 |
M | 24 | ×2 | 48 |
C | 13 | ×4 | 52 |
U | 32 | ×8 | 256 |
2 | 2 | ×16 | 32 |
1 | 1 | ×32 | 32 |
6 | 6 | ×64 | 384 |
7 | 7 | ×128 | 896 |
0 | 0 | ×256 | 0 |
6 | 6 | ×512 | 3072 |
Sum 4785 → 4785 mod 11 = 0 → check digit 0 → CMCU 216706-0
Tracking a Crowley container
Paste the number into the form at csight.crowley.com. We have not tested whether a link can carry the number there, so the checker on this page sends you to the form.
| Container number | ✓ yes |
|---|---|
| Bill of lading (B/L) | ✓ yes |
| Booking reference | — no |
| Mobile app | — no |
| Pre-filled link | not tried yet |
| Its bill of lading starts with | CMCU |
Browser-verified 2026-08-03
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 Crowley 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 the CMCU container prefix?
Crowley does, a shipping line founded in 1892 — the BIC register lists CMCU under it.
How do I track a CMCU container?
Free, on the official Crowley tracker at csight.crowley.com — paste the full 11-character number; no account is needed. The same tracker serves every number with this prefix.
Is CMCU a shipping line prefix or a leasing prefix?
A shipping line prefix — Crowley both owns the box and moves it, so the owner and the tracker are the same company.
Is CMCU2167060 a valid container number?
Yes — CMCU 216706-0 passes the ISO 6346 check: the weighted sum for CMCU216706 leaves a remainder of 0 when divided by 11, which gives check digit 0. It is an example computed for this page, not a box we have seen.
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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