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You have a container number and no idea which carrier. Now what?

The first four characters tell you the owner. That is usually enough to find the line.

Aron Mayer · 3 min read

Quick take

  • The owner prefix identifies the registered owner of the container.
  • Owner is not always the carrier, because leased containers are common.
  • Good tools detect the carrier for you and fall back to the bill of lading.

This happens constantly: a supplier sends a container number in an email with no other context, and now you need to know who is carrying it.

Start with the prefix

The first three letters are the owner code, registered internationally. MSCU is MSC, MAEU is Maersk, HLCU is Hapag-Lloyd, CMAU is CMA CGM. For carrier owned containers, which is most of them, the prefix takes you straight to the line.

When the prefix misleads

Roughly half the world fleet is leased. Prefixes belonging to leasing companies such as Triton or Textainer tell you who owns the steel and nothing about who is carrying it. A container with a lessor prefix could be on any line on any trade.

In that case the container number alone will not identify the carrier, and no tool can change that. You need the bill of lading number, the booking reference, or a message to whoever sent you the number.

See it on your own shipment

Paste a container number, bill of lading or booking reference. We detect the carrier across 170+ shipping lines, and when the data does not line up, a person checks it.

The shortcut

Paste the number and let the tool work it out. We check the prefix against the registry, identify the carrier where it is carrier owned, and query them directly. Where the prefix is a lessor, you will be asked for a bill of lading instead, which is the honest answer rather than a guess.

Questions people ask

What if the prefix belongs to a leasing company?

Then the container could be on any line. Use the bill of lading or booking number instead.

Can I look up a prefix myself?

Yes, prefix registries are public. It is a useful bookmark for anyone doing this manually.

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