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Before chartering, buying, insuring, financing, brokering or providing services to a vessel, screen it against every official sanctions regime that could apply to the transaction. Search the ship’s unique IMO number as well as its current and former names, investigate any alert against the complete official entry, and then assess ownership, control, counterparties, cargo, services, route and jurisdiction. A clear name search is not proof that the deal is lawful, and a possible match is not automatically a confirmed match. This is general compliance information, not legal advice.
The practical screening sequence
Use this order for each proposed transaction. Keep the jurisdiction and transaction facts visible at every step; the same vessel can present different legal risks depending on who is involved, what is being carried and which services are supplied.
- Map the sanctions nexus. List the locations of the parties, their nationality or incorporation, the vessel’s flag and ownership, the route, cargo, payment flows and proposed services. Identify the countries and sanctions programmes that could reach those facts.
- Open the current official source for each relevant jurisdiction. For UK designations, use the UK Sanctions List. For U.S. sanctions, use the Office of Foreign Assets Control (OFAC) sanctions-list search together with the relevant programme information.
- Collect reliable vessel identifiers. Obtain the seven-digit IMO number, present name, former names, flag, MMSI and owner or manager information from transaction documents and independent records.
- Search by IMO number and name. Run exact and variant searches, including aliases and spelling differences. The IMO number should be the primary key because it is intended to remain with the vessel through name or ownership changes.
- Resolve every alert. Read the full official entry and the measure attached to it. Compare IMO number, names, flag, owner, address and other identifiers. Follow your written procedure and escalate an uncertain or consequential result to qualified compliance or legal staff.
- Check risks outside a named-vessel list. Review ownership and control, counterparties, cargo, services, geography and sector restrictions. A vessel that does not appear in a search can still be involved in a prohibited transaction.
- Corroborate voyage information and document the decision. Use AIS and other voyage data to spot inconsistencies, but treat them as supporting evidence because location and identity data can be manipulated. Record what you searched, when, what you found and why you proceeded or escalated.
Why the applicable jurisdiction comes first
There is no universal “sanctions list” that answers every maritime transaction. Rules can attach through a party’s place of business, citizenship or incorporation; a bank or insurer; the vessel’s flag; the origin or destination of cargo; the location of services; or a connection with a sanctioned country, sector or activity. A transaction can therefore require several checks even when the ship itself has never been named.
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- Parties: charterer, owner, technical manager, ship manager, broker, shipper, consignee, insurer, financier, agent and payment bank.
- Locations and status: incorporation, residence, nationality, branch locations, flag state, ports, loading and discharge points, and any intermediary jurisdiction.
- Commercial facts: cargo type and origin, freight and payment currency, charter form, requested services, insurance, bunkering, repairs, classification and crewing.
- Timing: the date of screening and the expected dates of loading, transit, payment and delivery. Designations and programme rules can change between contract and performance.
Write down why each jurisdiction is relevant before searching. That prevents a team from treating one familiar list as a complete legal analysis.
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Use the current official lists
Always obtain the result from the government source that administers the relevant regime, not from an undated copy, a search-engine snippet or a third-party database alone. A commercial screening service can help with workflow, but the official entry and the applicable programme rules control the decision.
| Jurisdiction or source | What to use | What it can identify | Important limit |
|---|---|---|---|
| United Kingdom | UK Sanctions List; the list is searchable and downloadable | Designated persons and specified ships under UK sanctions regimes | Sectoral and geography-based measures may apply without a named-ship entry; check the relevant regime’s rules as well |
| United States | OFAC sanctions-list search plus the applicable OFAC programme materials | Names and entities designated under U.S. programmes, including vessel-related entries where listed | A name-list result does not resolve broader sanctions nexus, ownership or programme prohibitions |
United Kingdom: use the UK Sanctions List
UK maritime financial-sanctions guidance updated 28 January 2026 states that the UK Sanctions List is the only source for UK sanctions designations from that date. It contains designated persons and specified ships and can be searched or downloaded. Use the current list rather than relying on an older consolidated list, a PDF saved by a colleague or a historical web page.
After finding an entry, read the designation identifiers and the exact financial, trade, transport or other measure attached to the relevant regime. The list entry is only one part of the analysis: the regime may impose restrictions by sector, geography or activity even when no ship name appears.
United States: use OFAC’s search and programme information
For a transaction with a U.S. sanctions nexus, search OFAC’s current sanctions lists and then read the applicable programme information. OFAC advises organizations to use documented procedures and the complete list entry when resolving a potential match. Its FAQ states: “Many potential matches identified through screening are false positives.” That means an alert requires investigation, not an automatic decision either way.
OFAC’s maritime guidance, dated 31 October 2024, also discusses deceptive shipping practices, ownership obfuscation and enhanced vessel and cargo tracking. It states, in the context of U.S. persons, “All U.S. persons must comply with OFAC sanctions.” Do not extend that sentence into a general rule for every business; determine the actual U.S. nexus and obtain advice for the transaction.
Gather vessel identity before searching
Use at least two independent identity sources where possible. Ask the owner, broker or charterer for the vessel’s IMO number and historical names, then compare them with registration, class, flag or other authoritative records.
Make the IMO number your primary search key
The IMO number is a unique seven-digit vessel identification code. UK maritime guidance describes it as intended to remain permanent even when a ship changes name or ownership. Record all seven digits, including leading zeroes if present, and check that the number belongs to the same physical vessel in the documents you received.
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Capture names and related identifiers
- Current registered name and every former name or transliteration.
- IMO number, MMSI and call sign.
- Flag state, port of registry and vessel type.
- Registered owner, beneficial owner if known, commercial operator, technical manager and ISM manager.
- Construction year, gross tonnage and class information when available to distinguish similarly named ships.
- Recent ownership, flag and management changes, including the effective dates.
A name-only search is particularly weak because ships can share names, change names or be represented differently in different systems. An IMO match is stronger, but still compare the surrounding identifiers and the transaction context.
How to perform a sanctions check by IMO number and name
- Open the official list for the first relevant jurisdiction. Note the list name, access date and time, and whether you searched the online interface or a downloaded file.
- Search the exact IMO number. Try the seven-digit number with and without spaces or punctuation if the interface permits. Save the result or export a copy according to your records policy.
- Search the current vessel name. Try the exact spelling, uppercase and lowercase variants, punctuation variants and common transliterations.
- Search former names and aliases. Use every historical name supplied by the counterparty and any aliases shown in the official entry.
- Repeat for each jurisdiction and programme. Do not assume that a clean result in the UK source answers a U.S., EU, UN or other applicable question. Each regime has its own legal reach and data fields.
- Compare a hit with the full entry. Check the IMO number first, then names, owner, flag, address, dates and other identifiers. Read the measure, effective date, exceptions and licensing or reporting provisions in the programme materials.
- Route the result through your escalation rule. Freeze signing, payment, loading or service performance when your procedure requires it. Ask qualified compliance or legal staff to decide whether the facts establish a match, a false positive or an unresolved risk.
Do not treat a screenshot of a search box as the whole audit trail. Preserve the underlying entry or a stable export where permitted, together with the search terms and the person who reviewed the result.
Investigate a possible match without jumping to a conclusion
An alert is a prompt to compare identities and legal measures. It is not proof that the vessel is designated, and a no-hit result is not proof that the transaction is permitted.
Separate identity matching from legal applicability
- Identity question: Is the listed ship the same physical vessel? An exact IMO match is highly significant; a name-only match requires much more corroboration.
- Scope question: What does the designation prohibit or restrict? Read the measure and programme, rather than assuming every designation has the same effect.
- Nexus question: Does the proposed transaction involve a person, bank, service, cargo, country or sector covered by the rule?
- Timing question: Was the designation effective on the date of the contemplated act, and has it changed since the initial search?
Use a documented human review
Have a reviewer compare the complete official entry with the vessel file and record the reasoning. If identifiers conflict, ownership is opaque, documents appear altered or the consequences of a mistake are material, escalate rather than trying to “clear” the alert informally. Keep the transaction on hold if your internal policy requires a decision before any contract, payment, cargo movement or service.
Look beyond the ship’s name
Sanctions exposure can arise through the people and activity around a vessel. Conduct a related-party review using the same official sources and the information available for the transaction.
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Ownership and control
Identify the registered owner and investigate beneficial ownership, control and management changes. Consider whether a listed person owns, controls or directs a company involved with the vessel, even if the ship itself is not named. Review ownership chains, nominee arrangements, recent transfers and companies formed shortly before the voyage. Where the evidence is incomplete, treat the uncertainty as a risk requiring escalation, not as evidence of a clean structure.
Counterparties and financial participants
Screen the charterer, owner, operator, broker, shipper, consignee, insurer, financier, agent and payment bank. A vessel may be unlisted while a counterparty or financial institution is subject to restrictions. Confirm who will receive freight, commissions, insurance proceeds and other payments, and through which banks and currencies.
Cargo, services and geography
Check the commodity, origin, destination, ports, route, transshipment points and end use. Assess whether the proposed service—such as broking, chartering, insurance, bunkering, repairs, classification, crewing or financing—is restricted for the relevant sector or geography. A clean vessel result cannot override a prohibition on the cargo, service or destination.
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Use AIS and voyage information as corroboration
Automatic Identification System (AIS) records, port calls, satellite data and voyage documents can reveal inconsistencies between the declared voyage and observed activity. They are useful for enhanced due diligence, especially when the trade involves elevated shipping risk.
Do not make AIS the deciding source. UK guidance describes spoofing that can broadcast a different vessel name, IMO number, MMSI or other information. OFAC’s maritime guidance also addresses location-data manipulation, document falsification and ownership obfuscation. Compare multiple time-stamped sources, investigate unexplained gaps or impossible movements, and ask for supporting bills of lading, certificates and port records. Manipulated or contradictory data should increase scrutiny; it should not be “fixed” by choosing the record that supports the deal.
Decide whether to proceed, pause or escalate
| Screening outcome | Practical response |
|---|---|
| No official hit and no unresolved broader risk | Complete the ownership, counterparty, cargo, service and geography review, document the basis for proceeding, and set a date for re-screening before performance. |
| Name-only hit with different IMO number or conflicting identifiers | Document the comparison as a potential false positive, retain the full entries reviewed, and obtain the required compliance sign-off. |
| Exact IMO match or credible evidence of a designated owner or controller | Pause the affected transaction and escalate to qualified compliance or legal staff before signing, paying, loading or providing services. |
| Unclear ownership, altered documents, AIS anomalies or unexplained route changes | Apply enhanced due diligence, seek independent evidence and do not rely on a clean list search while material questions remain. |
| Restriction appears to depend on a licence, exception or specific programme rule | Obtain advice on the exact conditions and preserve the licence or legal analysis with the transaction file before proceeding. |
This table is a workflow aid, not a legal determination. Your internal policy may require a stricter response.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep an auditable screening record
A defensible file lets another reviewer reconstruct what you knew when the decision was made. For each search, retain:
- Date and time, time zone and reviewer.
- Official source, list or programme searched and the access method.
- IMO number, current and former names, aliases and other identifiers used.
- Search results, full entries and applicable measures, subject to lawful retention and security controls.
- Vessel, ownership, counterparty, cargo, service, route and jurisdiction information considered.
- Any alert-resolution notes, requests for additional documents, escalation decisions and approvals.
- The reason for proceeding, pausing, rejecting or obtaining a licence, plus the next re-screening date.
The exact format is a business-process choice, but the record should be complete enough to show the source, timing, identity evidence, analysis and decision. Re-screen when a designation, owner, flag, route, cargo or counterparty changes and immediately before a material performance event.
Common screening failures and how to correct them
Searching only the current name
Why it fails: names change and different systems use aliases or transliterations.
Correction: search the IMO number, current name, every known former name and relevant variants.
Using a single list for every deal
Why it fails: legal reach depends on the transaction and the parties, and restrictions can be sectoral or geography-based.
Correction: map the sanctions nexus first, then search the current official source for each relevant jurisdiction and programme.
Clearing an alert from a matching name alone
Why it fails: unrelated ships and companies can share a name, while a true match may be hidden by inconsistent data.
Correction: compare the full entry, starting with the IMO number, and obtain documented human review.
Treating a clean search as permission
Why it fails: ownership, counterparties, cargo, services and broader rules may create exposure without a named-vessel entry.
Correction: complete the wider transaction review and record the legal basis for proceeding.
Trusting AIS or an unverified document
Why it fails: identity, location and shipping documents can be spoofed, falsified or manipulated.
Correction: corroborate with independent, time-stamped evidence and escalate unexplained discrepancies.
Failing to record the search date
Why it fails: lists and designations change, so an old “clear” result may not describe the transaction date.
Correction: timestamp every check, retain the source and re-screen before signing and performance milestones.
A worked pre-charter workflow
Suppose a company is considering a time charter. Before agreeing terms, it should identify the proposed charterer, owner, manager, broker, insurer, banks, cargo, ports and route. It should obtain the vessel’s IMO number and former names, search the current UK Sanctions List and any OFAC source made relevant by the parties or payment chain, and repeat the process for other jurisdictions identified in the transaction map.
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When to obtain specialist advice
Seek qualified sanctions or maritime legal advice when an IMO number appears in an official entry; ownership or control is opaque; a counterparty, bank, cargo, service or destination may be restricted; a licence or exception could apply; documents or voyage data conflict; or the commercial consequences of a wrong decision are significant. Official list searches are an essential control, but they do not replace transaction-specific legal analysis.
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