GlossaryEN1 min readUpdated: Jun 18, 2026

IMO Number Screening

An IMO number is a seven-digit, permanent identifier assigned to every seagoing vessel by the International Maritime Organization, remaining unchanged across re-flaggings and ownership transfers.

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Last updated: 18 June 2026Published: 27 January 2026

Source: https://www.imo.org/en/OurWork/MSAS/Pages/IMO-Identification-Number-Scheme.aspx

Category

Logistics concept

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1 min

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123

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Definition & Explanation

An IMO number is a seven-digit, permanent identifier assigned to every seagoing vessel by the International Maritime Organization, remaining unchanged across re-flaggings and ownership transfers. Screening this number means cross-checking it against official registries – such as IHS Sea-web or Lloyd's Register – to confirm that the recorded vessel name, flag state, and registered owner match the presented documents, and to detect discrepancies that may indicate identity manipulation or sanctions evasion. The process is a core element of maritime due diligence: it applies when onboarding new counterparties, accepting cargo bookings, and during Port State Control inspections. Because the IMO number cannot be altered, it is the most reliable single identifier for a vessel and the logical starting point for any rigorous vessel verification.