18/05/2026
Understanding the numbers and coding on shipping containers:
⚓ Shipping containers are large, standardized steel boxes specifically designed for transporting cargo safely and efficiently across the globe.
⚓ A shipping container is not just a metal box but a regulated transport modal unit within the international maritime law, customs services, port authority, safety regulations, security monitoring systems, and global logistics networks.
Because of this, every marking, symbol, logo, code and plate on the container serve vital purpose for information, safe operations and secure goods transportation. Nothing is placed for decoration.
⚓ A single mistake in a container number, weight declaration, or marking can create major problems such as cargo delays, customs holds, misdelivery, vessel loading errors, security concerns, safety incident and financial losses. That is why ports, shipping lines, custom agencies, and logistics companies rely heavily on container markings for daily operations.
⚓ Container numbers (e.g., MSCU 1234567), is the official global identification number issued assigned to a particular shipping container. It works like a license plate, passport, or finger prints for the container because no two containers in the world shares same number. This number allow for easy identification of the container and be tracked globally throughout it's entire transport journey- from the shipper's wharehouse to the final destination.
Container numbers are painted or printed on:
✔️Right-hand
✔️Both side walls
✔️On the roof or front panel
It is designed to be clearly visible so ports and terminal officers officers, custom officers, shipping lines agents, truck drivers, and scanners can identify the container quickly.
⚓ Container number is divided into 3 main parts.
Example: MSCU 1234567
⚓ Owner/Operator Code (first 4 letters) MSCU.
This section identify the company that owns or operates the container.
🔗First 3 three letters = Registered company code.
🔗Last letter = Equipment category identifier.
Common equipment category letters are:
🔗U = meaning freight container
🔗J = meaning detachable container
🔗Z = meaning trailer or chassis
In most shipping containers, the last letter is usually "U", meaning it is a standard freight container.
In container shipping, UBKU refers to a standardized 4-letter BIC code (prefix) that indicates the official ownership or operator registration of a shipping container. Under the ISO 6346 standard, the "U" signifies a freight container, while the "B" and "K" identify the specific company or leasing pool.
In this case, MSCU = Mediterranean Shipping Company Container.
Other examples:
MAEU = Maersk container
TGHU = Textainer container
This owner code is registered internationally under ISO 6345 standard container identification system.
Note, that the ability to interpret container information is an important professional and operational skill for anyone involved in logistics, shipping and maritime operations.