What is the shadow fleet?

In brief

• What it is: a description of behaviour, not a legal category. Ships that carry sanctioned cargo outside mainstream ownership, insurance and class.
• How big: published estimates run from about a thousand to well over fourteen hundred ships, depending on what is counted.
• What can be checked: as of 2 October 2026, 1,983 ships are currently named by at least one of eight authorities. 1,175 (59%) are named by only one; 52 by seven.
• What the term does not mean: a ship being “in the shadow fleet” has no legal consequence by itself. A listing by a specific authority, under a specific instrument, does.

What the term means

“Shadow fleet” describes tankers and other vessels that carry sanctioned cargoes while operating outside the ownership, insurance and classification arrangements that the rest of world shipping uses. It is a description of behaviour, not a legal category. No regulation defines it, no authority publishes a register of it, and no two organisations count it the same way.

That matters more than it sounds. When a news report says the shadow fleet numbers “around 1,400 vessels” and a government list contains a few hundred, both can be right, because they are counting different things.

Where the term came from

The phrase entered general use after 2022, when the G7 price cap on Russian crude created a commercial split: vessels that stayed inside the Western services system and accepted the cap, and vessels that left it. But the underlying practice is much older. Tankers moving Iranian and Venezuelan crude had been using the same techniques for years, and the North Korea sanctions regime documented ship-to-ship transfers and AIS manipulation well before Russia’s full-scale invasion of Ukraine.

The International Maritime Organization eventually adopted the vocabulary itself. In December 2023 the IMO Assembly passed resolution A.1192(33), which urges member states to act against illegal operations “by the ‘dark fleet’ or ‘shadow fleet’”, and identifies the specific practices that concern it: unreported ship-to-ship transfers, disabling or manipulating transponders, and fraudulent registration.

That resolution is worth reading precisely because it is not a sanctions instrument. It frames the problem as one of safety and of the integrity of the flag-state system, which is a different argument from the sanctions one and, in some ways, a more durable one.

Three loose tiers

Analysts generally sort vessels into tiers. The boundaries are conventions, not law.

The cleared fleet is ordinary shipping: mainstream owners, a classification society belonging to the International Association of Classification Societies, protection and indemnity cover from an International Group club, and a trade that stays inside the price cap where relevant.

The grey fleet still touches the regulated system somewhere. It might keep recognised class, or use a mainstream insurer, while its ownership sits behind a chain of single-ship companies and its trade patterns have changed to carry sanctioned oil.

The dark fleet has left the regulated system in most respects: cover from insurers whose ability to pay a major pollution claim is untested, class from societies outside the international association, repeated changes of flag and name, and long gaps in transponder coverage.

Cutting across all three is the category this site actually tracks: vessels an authority has named. A hull can be firmly in the dark fleet and appear on no list. Another can be listed by the European Union alone while trading lawfully everywhere else.

Why the numbers differ

Published estimates in 2026 spanned roughly a thousand to well over fourteen hundred vessels. The spread comes from four decisions each counter has to make.

Which vessels count. Some counts include only crude and product tankers above a size threshold. Others add liquefied gas carriers, general cargo ships moving military-related goods, and the small coastal tankers that feed larger ships offshore. The threshold alone can move a total by hundreds.

What qualifies a vessel. One sanctioned voyage, or a pattern? Carrying Russian crude above the cap, or carrying it at all? Using non-Western insurance, or having no traceable insurance?

What the evidence is. Counts based on designations are reproducible: anyone can check them against the published lists. Counts based on behaviour rest on commercial tracking data and on judgements about what a gap in coverage means. Both are legitimate; only the first can be audited by a reader.

When the count was taken. The population turns over constantly as vessels are listed, delisted, sold, renamed or scrapped.

Our own figures are deliberately the narrow kind. This site counts hulls that appear on an official list, and says which authority listed each one; how it builds each record is set out in full. Those totals will always be smaller than a behavioural estimate, and unlike one, any reader can check them against the published lists.

How many ships have actually been named?

The only part of the shadow fleet that can be counted the same way twice is the part an authority has put on a list. This site reads the published lists every night and keeps each authority’s entry separately. As of 2 October 2026, the number of distinct ships each one currently lists is:

Authority	Ships currently listed
United States (OFAC)	1,526
Canada	731
European Union	708
Switzerland	690
United Kingdom	670
Australia	357
New Zealand	210
United Nations (DPRK vessels)	58

Those columns do not add up to the total, because many ships are on several lists. Counted once each, 1,983 ships are named by at least one authority. The overlap is the interesting part: 1,175 of them (59%) are named by one authority only, 656 (33%) by four or more, and just 52 by seven. The lists are different instruments with different legal bases and evidence thresholds, which is why one authority’s total says little about another’s. The disagreements page shows every gap ship by ship, and the statistics page keeps these figures current.

Ukraine’s War & Sanctions catalogue is held separately and never counted in any figure above: it records vessels of concern but is not a legal designation. A further 120 ships appear there and on no authority’s list.

What the listed ships look like

The listed population is not a uniform fleet of Russian crude tankers. Of the 1,983, at least 732 are recorded as crude or oil tankers; the rest include 181 general cargo ships and 151 fishing vessels, because the same lists also cover Iranian, North Korean and other programmes. Where a build year is recorded (1,074 ships, a little over half), the average ship is about 22 years old and the oldest was built in 1965. The ageing fleet explainer covers why that matters.

The most common current flags are Panama (341 ships), Russia (309), Iran (192), China (159), Barbados (89), Palau (72) and Comoros (71); 162 ships have no recorded flag. These are the flags most recently recorded on a list, not a verified registry history, because the lists do not date flag changes. See Panama and the other flag pages for the ships under each.

What these vessels have in common

Look across the listed population and the same features recur. The ships are old, often past the age at which mainstream charterers would take them. Ownership sits in single-ship companies, frequently in jurisdictions that publish little. Management changes hands soon after a designation. Flags change more often than a normal trading career requires, and sometimes the register itself turns out not to be a register at all.

None of these features is unlawful on its own. Old ships trade legally; single-ship companies are standard practice; changing flag is routine after a sale. What draws attention is the combination, and its timing relative to a designation.

Why it matters beyond sanctions

The sanctions argument is not the only one. Older ships, thin insurance and unclear ownership raise the question of who pays when something goes wrong. Five ships in this database have a sourced incident on record, each reported by a named outlet and attributed on the vessel’s own page:

• EVENTIN lost propulsion in the Baltic in January 2025 while carrying about 99,000 tonnes of crude, and was taken under tow by German tugs.
• EAGLE S was seized by Finland on 26 December 2024, a day after the Estlink 2 power cable was damaged; Finnish broadcaster Yle reported the cable was suspected to have been cut by the ship’s anchor.
• KIWALA was detained by Estonia in April 2025 after officials said its flag registration could not be confirmed.
• FLORA 1 was boarded by the Swedish Coast Guard in April 2026 on suspicion of causing an oil slick, and released after two days.
• JIN HUI was detained off Trelleborg, Sweden, in May 2026 after Swedish authorities said its claimed Syrian registration was false.

These are reports and official statements, not findings of liability, and the pages say who said what. The IMO’s own resolution on the subject frames the issue the same way: as one of safety and the integrity of flag-state registration as much as sanctions. For how ships hide in the data, see AIS going dark and spoofing and who uses the shadow fleet.

What it means for a specific ship

The honest answer for any individual hull is narrower than the headline. A vessel is not “in the shadow fleet” in a way that carries legal consequences. It is either listed by a particular authority under a particular instrument, with particular effects, or it is not.

That is why every page on this site answers a smaller question than “is this a shadow-fleet ship?”. It answers: who listed this hull, on what date, under which program, with what stated reason, and what does that instrument actually prohibit. The asset freeze, port ban and services ban explainer sets out the difference between those effects, and how a ship gets sanctioned walks through the process at each authority.