What Is an IMO Number? A Complete Guide for Shipowners and Marine Spare Parts Buyers
If you work with ships, marine engines, ship management, or marine spare parts, you will often come across the term IMO Number.
But what exactly is an IMO number? Why does every vessel have one? And why do marine spare parts suppliers often ask customers to provide the vessel’s IMO number when preparing a quotation?
In this guide, we explain everything you need to know about IMO numbers and why they are important when ordering marine engine spare parts.
What Is an IMO Number?
An IMO number is a unique identification number assigned to a ship.
IMO stands for the International Maritime Organization, the United Nations agency responsible for regulating international shipping.
An IMO number is a permanent identifier for a vessel. Unlike a ship’s name, flag, or registered owner, the IMO number normally remains associated with the vessel throughout its operational life.
For example:
IMO Number: 1234567
An IMO number consists of seven digits and is usually written with the prefix “IMO”.
The number is commonly displayed as:
IMO 1234567
The IMO number system is used internationally to improve vessel identification and maritime safety.
Why Does a Ship Need an IMO Number?
A ship’s name can change.
Its owner can change.
Its flag can change.
Even its management company can change.
However, the IMO number provides a consistent identification reference for the vessel.
This makes it easier for:
- Shipowners to identify vessels
- Ship managers to manage their fleets
- Shipyards to identify vessels during repair
- Marine suppliers to identify the correct vessel
- Classification societies to maintain vessel records
- Port authorities to identify ships
- Government authorities to monitor vessels
- Marine insurers and other organizations to maintain accurate records
For the maritime industry, the IMO number is therefore much more than just a seven-digit number.
It is a permanent vessel identification reference.