Size and Type Code

Identification Number

The letters and numerals of the owner code, equipment category identifier, serial number and check digit shall be not less than 100 mm (4 in) high.
All characters shall be of proportionate width and thickness, they shall be durable and in a colour contrasting with that of the container.

Size and Type Lookup Tool

  • Standard dry van
  • High cube dry van
  • Reefer
  • Open top
  • Flat rack
  • Tank
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Main characteristics

This information is mandatory.
When displayed on the container, the size and type codes shall be used as a whole.


In 1995 there was an ISO agreement concerning container marking codes to depict the length, height and type of container in an easy to read sequence. This sequence is composed of four letters or digits that commonly appear right under the container identification sequence.

  • The first character is related to the length of the container
  • The second character is relative to its height.
  • The remaining two elements of the sequence identify the container type and characteristics


Length Height Type
2 – 20 Feet 2 – 8 Feet 6 Inches G1 – General Purpose Container
4 – 40 Feet 5 – 9 Feet 6 Inches “High Cube” R1 – Refrigerated Container
L – 45 Feet U1 – Open Top Container
M – 48 Feet P1 – Platform Container
T1 – Tank Container

Container Size code designation

The two alphanumeric characters used to designate the size code of the container are chosen as follows:

Container Type code designation (ISO 6346 AMENDMENT 3)

The third characters gives the codes to identify the container type and other characteristics related to its type.

Warning: new container type code using an alpha character in the 4th position of the size-type code indicates a container of reduced strength. (See detailed type code ‘b’). see link to table 3

You can also access the container size and type code information via an API ( for direct system integration) using BIC’s BoxTech – Global Container Database.

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