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When people think about sanctions, they picture blocked companies and banned people. But ships get sanctioned too. If you want to screen vessels for sanctions, you need to check the ship itself, not only the parties on the paperwork. A tanker or bulk carrier can sit on a government list. Moving cargo on that ship can put you in breach.
This guide is for shippers and freight forwarders. It shows what to check and what warning signs to watch. It is part of our wider work on denied party screening. Vessel checks fit inside that same process. They just add a few extra steps.
Why vessels get sanctioned
Governments can name a specific ship on a sanctions list. The US Treasury does this through OFAC. The vessel becomes blocked property. Other countries do the same. A ship gets listed when it carries banned cargo, moves oil above a price cap, or helps a sanctioned country dodge the rules.
Once a ship is listed, the risk follows the hull. It does not matter who owns it this week. If you book space, supply bunkers, or handle its cargo, you may deal with a blocked party. That is why vessel screening sits next to party screening. You can read more on the OFAC SDN list, which is where many named vessels appear.
Check the vessel name and IMO number
Start with two things. The vessel name and the IMO number. The name can change. Owners rename ships often. The IMO number does not change. It stays with the hull for the life of the ship. That makes it the stronger identifier.
Screen both against the lists. Match the name and match the seven digit IMO number. If either one hits, stop and look closer. A name match alone can be a false alarm, since many ships share similar names. The IMO number gives you a firm link. For help telling real hits from noise, see our note on false positives in screening.
Which lists to screen against
You do not screen against one list. You screen against several. Named vessels can show up in more than one place. Here is a simple view of common sources.
| Source | What it covers |
|---|---|
| OFAC SDN list | Blocked vessels named by US Treasury, listed with IMO numbers |
| Consolidated Screening List | A combined US government feed that pulls several lists together |
| UN, EU and UK sanctions | Other regimes that may name the same or different ships |
The Consolidated Screening List is a good start for US rules. But check the regimes that apply to your trade. A ship clear under one regime can be listed under another.
Red flags to watch for
A ship can be clean on every list and still worry you. Behaviour matters. Some patterns point to sanctions evasion. Watch for these signs.
AIS gaps
Ships carry an AIS transponder. It broadcasts position, speed and identity. Crews are meant to keep it on. When a ship switches it off, it goes dark. Short gaps happen for real reasons. Long or repeated gaps near sensitive areas are a red flag. A ship going dark may be hiding a port call or a transfer.
Flag hopping
Every ship flies a flag from the country where it is registered. Changing flag is normal at times. Changing flag again and again in a short span is not. Rapid flag hopping can be an attempt to shake off scrutiny. Check the flag history against the IMO number, since the number stays fixed.
Ship-to-ship transfers
Two ships meet at sea and move cargo between them. This is a ship-to-ship transfer. It has legal uses. But it also hides the true origin of cargo. A transfer done in the open sea, with AIS off, and outside a normal port is a strong warning. It is a classic way to disguise sanctioned oil.
For a fuller list of warning signs across trade, see our guide to sanctions evasion red flags. Many of the same patterns apply on land and at sea.
A practical screening routine
Turn this into a simple set of steps. Run it before you commit to a booking. Repeat it if the voyage changes.
- Collect the vessel name and IMO number from the booking.
- Screen both against the sanctions lists that apply to your trade.
- Check the flag and recent flag changes.
- Look at AIS history for dark periods near sensitive waters.
- Ask about any ship-to-ship transfers on the route.
- Screen the owner, operator and charterer as parties too.
- Save what you checked and what you found.
The last step matters. Keep an audit trail. Record the date, the lists, and the result. If a regulator asks later, you can show your work. This mirrors the wider method in our guide on how to do denied party screening.
What this means for forwarders
Freight forwarders sit in the middle of the deal. You may not own the ship. But you help move the cargo. That can be enough to draw liability. Build vessel checks into your booking process. Do not treat them as an afterthought.
If you handle ocean freight often, see our guide to denied party screening for freight forwarders. It covers how to fit these checks into daily work without slowing every shipment.
Frequently Asked Questions
Is the IMO number better than the vessel name?
Yes. The name can change many times. The IMO number stays with the hull for life. Always screen the IMO number when you have it. Use the name as a second check.
Does an AIS gap always mean evasion?
No. Signals drop for real reasons, like weather or coverage. The concern is a long gap, or a repeated one, near sensitive waters. Treat it as a reason to ask more questions, not as proof.
Do I still need to screen the parties?
Yes. Vessel screening adds to party screening. It does not replace it. Screen the owner, the operator and the charterer as well. A clean ship can still have a listed party behind it.
Key Takeaways
Ships can be sanctioned, so screen the vessel and not only the parties. Check the name and the fixed IMO number against the lists that apply. Watch for AIS gaps, flag hopping and odd ship-to-ship transfers. Fold these steps into your booking flow and keep a record of each check. If you want help building a vessel screening process that fits your trade, contact our team.