# Iran Blockade: What Gulf Port Suppliers Should Read > The US naval blockade on Iran is near-total but leaking LPG and jet fuel. What chandlers, bunker suppliers and agents should change in their port-call routine. URL: https://vesselreach.si/blog/iran-blockade-what-gulf-port-suppliers-should-read | Published: 2026-10-24 | Industry news | Topic: Carrier service and surcharge changes ## At a glance - **What: What is happening to Iranian shipping?** A US naval blockade targeting Iranian ships and ports is assessed as nearly 100 percent effective, and reporting on 23 October 2026 describes it as deepening and also widening beyond its original scope. ([The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-deepening-but-also-widening)) - **Who: Who is enforcing the blockade?** The United States Navy is enforcing the blockade on Iranian ships and ports, according to The Maritime Executive's reporting on how effective the operation has been at pressuring Iran. ([The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-now-hitting-home)) - **Where: Where is the blockade being felt?** The blockade targets Iranian ships and ports, and its effects are reported as hitting home inside Iran, while enforcement is described as widening beyond that initial scope. ([The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-now-hitting-home)) - **When: When did the latest developments emerge?** Reporting on 19 October 2026 described the blockade hitting home, and on 23 October 2026 it was described as deepening and widening. Data published on 16 October 2026 showed exports continuing since July. ([gCaptain](https://gcaptain.com/iran-ships-some-lpg-jet-fuel-despite-us-blockade-data-shows/)) - **Why: Why is the blockade not fully stopping exports?** Shipping intelligence and security sources cited by gCaptain show Iran has still managed to export some liquefied petroleum gas and jet fuel since July, despite the US naval blockade on its ships and ports. ([gCaptain](https://gcaptain.com/iran-ships-some-lpg-jet-fuel-despite-us-blockade-data-shows/)) - **How: How is the pressure being applied and measured?** Analysts use the best available information to assess how effective the blockade has been at pressuring Iran, according to The Maritime Executive, which reports the operation as both deepening and widening. ([The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-deepening-but-also-widening)) The US naval blockade on Iran is close to total for Iranian ships and ports, yet Iran has still moved some LPG and jet fuel since July. For maritime service providers, the practical question is which port calls, counterparties and quotes now need a second look. According to [The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-deepening-but-also-widening) (23 October 2026), the blockade is generally accepted as nearly 100 percent effective but is both deepening and widening. That widening matters more to a ship chandler in Fujairah or a port agent in Colombo than the headline effectiveness figure. ## What happened and when The blockade has tightened through October 2026. [The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-now-hitting-home) reported on 19 October that the pressure was beginning to hit home inside Iran, and on 23 October that enforcement was extending beyond Iranian-flagged tonnage. Iran is not fully cut off. According to [gCaptain](https://gcaptain.com/iran-ships-some-lpg-jet-fuel-despite-us-blockade-data-shows/) (16 October 2026), shipping intelligence and security sources show Iran exported some liquefied petroleum gas and jet fuel since July despite the naval blockade. Those two facts sit together: enforcement is strong on paper, and small volumes of high-value product still move. Suppliers should plan for both. ## Why a blockade changes port-call work, not just politics A blockade (a naval operation to stop ships entering or leaving specified ports) redirects trade rather than ending it. Cargoes reroute, ship-to-ship transfers increase, and vessels arrive at neighbouring ports with incomplete or altered documentation. That lands directly on service providers. A chandler asked to supply a vessel whose last port of call is unclear, or an agent asked to file PDAs (pro forma disbursement accounts, the estimate of port costs sent before a call) for a ship with a gap in its voyage history, is now handling a compliance question as well as a commercial one. Research on how shipping networks behave under pressure is instructive. A 2025 study in *Logistics* found the global container network is scale-free, which makes it resilient to random failures but exposed to targeted disruption at high-centrality nodes such as Singapore and Shanghai ([Logistics, 2025](https://doi.org/10.3390/logistics9010006)). Blockade enforcement concentrates risk at specific chokepoints rather than spreading it evenly. ## What it means commercially, segment by segment ### Ship chandlers - Expect more vessels arriving with short notice and incomplete requisition history, especially on Gulf and Indian Ocean routes. - Check the vessel's recent port calls before accepting a large fresh-provisions order; a gap in the AIS (Automatic Identification System, which broadcasts a ship's position and identity) track is a prompt to ask, not to guess. - Keep a written record of what you supplied and to whom. If a counterparty is later questioned, your paperwork is your defence. ### Bunker suppliers Bunker demand shifts with rerouting, and the volumes are not trivial. According to [Hellenic Shipping News](https://www.hellenicshippingnews.com/antwerp-bruges-bunker-sales-rise-5-on-the-quarter-as-vlsfo-jumps/) (23 October 2026), Antwerp-Bruges sold 2.16 million mt of bunker fuel in the third quarter, up 5% from 2.05 million mt in the second and ahead of Rotterdam for the quarter. That is a European example of the general pattern: when one route closes, fuel demand reappears at a different port. For Gulf and Indian Ocean bunker suppliers, the test is whether a stem enquiry comes from a buyer you can verify. Run the credit and sanctions check before re-quoting, not after. ### Port agents Agents carry the documentation risk. A vessel whose ownership or chartering chain touches a sanctioned party can leave the agent exposed on payments and on the husbandry (the routine services a port agent arranges for a ship, from crew transport to cash to owner) side of the call. Sanctions relief elsewhere is moving in the opposite direction, which makes the picture harder to read. According to [Hellenic Shipping News](https://www.hellenicshippingnews.com/gibson-tanker-report-diesel-drones-and-donald/) (23 October 2026), the US Treasury issued General License 135 on 9 October as part of a run of sanctions easing. Separately, analysts cited by [Hellenic Shipping News](https://www.hellenicshippingnews.com/us-waiver-eases-risks-for-india-china-but-wont-alter-russian-crude-flows/) (23 October 2026) said a US waiver on Russian crude reduced uncertainty for Indian and Chinese refiners without materially changing flows. Easing on one file and tightening on another is exactly when a supplier should stop relying on memory. ### Repair yards and marine service companies Yards in the region should expect enquiries from operators who want work done away from exposed routes. Ask early whether the vessel's trading pattern involves Iranian ports, and price the compliance work into the quotation. ## How to respond: a four-step routine 1. **Screen before you quote.** Check the vessel, the registered owner, the technical manager and the charterer against sanctions lists. A clean IMO number (the permanent seven-digit identifier assigned to a ship) does not mean a clean counterparty chain. 2. **Read the voyage history, not just the ETA.** An unexplained gap in recent port calls is a question to put to the technical superintendent or the agent before the vessel arrives. 3. **Document the decision.** Keep the screening result, the date and who approved the supply. Regulators and banks ask for this later. 4. **Quote the work you can verify.** Decline politely and quickly where the counterparty cannot be confirmed. A fast no protects the relationship better than a slow maybe. The same discipline applies to payments. Our guide to [verifying a PDA before you pay](https://vesselreach.si/blog/pda-fraud-and-bank-detail-change-scams-how-port-suppliers-verify-a-payment-reque) covers the bank-detail side of the same problem, and [who you quote and who you bill when sanctions bite](https://vesselreach.si/blog/ship-agent-sanctions-who-you-quote-who-you-bill) sets out the invoicing question. ## The wider context worth tracking Blockade risk is now part of a broader pattern of route disruption. Freight markets are already adjusting: [Hellenic Shipping News](https://www.hellenicshippingnews.com/what-is-changing-behind-dry-bulk-and-tanker-freight-markets/) (23 October 2026) reported that commodity developments, not just vessel supply, are shaping dry bulk and tanker freight in the coming weeks. Regulation is moving at the same time. At the Global Maritime Forum Annual Summit 2026 in Shanghai, the shipping community called for IMO regulation to turn first-mover action into a global transition ahead of a pivotal December for the Net-Zero Framework ([Hellenic Shipping News, 23 October 2026](https://www.hellenicshippingnews.com/shipping-community-issues-clear-call-for-imo-regulation-to-turn-first-mover-action-into-a-global-transition/)). None of this replaces the blockade in a supplier's planning. It simply means compliance, fuel demand and route risk are now moving on the same weeks. ## How VesselReach helps VesselReach turns the vessel traffic heading for your ports into a screened, prioritised list of companies to approach, so compliance work starts from a verified counterparty rather than a cold enquiry. - **Vessel intelligence:** VesselReach shows vessels near your selected ports plus scheduled and expected arrivals, which means you can check a ship's approach and decide whether to engage before the ETA window closes. - **AI company targeting and decision-maker discovery:** the platform identifies the owner, manager or operator behind each vessel and finds the relevant roles, which means your first email reaches the technical superintendent or procurement contact rather than a general inbox. - **Staged multichannel outreach:** email, WhatsApp and phone outreach run in sequence with automated follow-ups, which means you can pursue the calls you have cleared without contacting the ones you have not. Book a VesselReach demo to see the workflow on your own ports, with a 10-day free trial offered after the meeting. ## Frequently asked questions ### Is the US blockade on Iran stopping all Iranian oil and gas exports? No. The blockade is widely assessed as nearly 100 percent effective on Iranian ships and ports, but shipping intelligence shows Iran still exported some LPG and jet fuel since July 2026, according to gCaptain. Gulf suppliers should plan for tight enforcement and occasional cargoes still moving. ([gCaptain](https://gcaptain.com/iran-ships-some-lpg-jet-fuel-despite-us-blockade-data-shows/)) ### What is a naval blockade and why does it change port-call work? A naval blockade is an operation to stop ships entering or leaving specified ports. It redirects trade rather than ending it: cargoes reroute, ship-to-ship transfers increase, and vessels reach neighbouring ports with incomplete or altered documentation, so chandlers and port agents handle a compliance question alongside the commercial one. ([The Maritime Executive](https://maritime-executive.com/article/the-blockade-on-iran-is-deepening-but-also-widening)) ### How should a ship chandler check a vessel before supplying it? Screen the vessel, registered owner, technical manager and charterer against sanctions lists, and review recent port calls for unexplained gaps before accepting a large order. A clean IMO number does not mean a clean counterparty chain. Keep a dated record of the screening result and who approved the supply. ### What does a widening blockade mean for Gulf bunker demand? Rerouting moves fuel demand between ports rather than removing it. Antwerp-Bruges sold 2.16 million mt of bunker fuel in the third quarter of 2026, up 5% from 2.05 million mt in the second quarter and ahead of Rotterdam, showing how quickly bunker volumes shift between competing ports. ([Hellenic Shipping News](https://www.hellenicshippingnews.com/antwerp-bruges-bunker-sales-rise-5-on-the-quarter-as-vlsfo-jumps/)) ### Are sanctions on other trades easing at the same time? Yes, and that is what makes the picture hard to read. The US Treasury issued General License 135 on 9 October 2026 as part of a run of sanctions easing, and analysts said a US waiver on Russian crude reduced uncertainty for Indian and Chinese refiners without materially changing flows. ([Hellenic Shipping News](https://www.hellenicshippingnews.com/gibson-tanker-report-diesel-drones-and-donald/)) ### How can a port agent reduce exposure on a questionable port call? Verify the ownership and chartering chain before filing the pro forma disbursement account, put the compliance question to the technical superintendent or owner in writing, and decline quickly where the counterparty cannot be confirmed. A fast, documented refusal protects the relationship better than a slow maybe. ## Sources 1. [The Blockade on Iran is Deepening – But Also Widening](https://maritime-executive.com/article/the-blockade-on-iran-is-deepening-but-also-widening), The Maritime Executive, 2026-10-23 2. [Shipping community issues clear call for IMO regulation to turn first-mover action into a global transition](https://www.hellenicshippingnews.com/shipping-community-issues-clear-call-for-imo-regulation-to-turn-first-mover-action-into-a-global-transition/), Hellenic Shipping News, 2026-10-23 3. [What is changing behind dry bulk and tanker freight markets?](https://www.hellenicshippingnews.com/what-is-changing-behind-dry-bulk-and-tanker-freight-markets/), Hellenic Shipping News, 2026-10-23 4. [Antwerp-Bruges bunker sales rise 5% on the quarter as VLSFO jumps](https://www.hellenicshippingnews.com/antwerp-bruges-bunker-sales-rise-5-on-the-quarter-as-vlsfo-jumps/), Hellenic Shipping News, 2026-10-23 5. [Gibson tanker report – Diesel, Drones and Donald](https://www.hellenicshippingnews.com/gibson-tanker-report-diesel-drones-and-donald/), Hellenic Shipping News, 2026-10-23 6. [US waiver eases risks for India, China, but won’t alter Russian crude flows](https://www.hellenicshippingnews.com/us-waiver-eases-risks-for-india-china-but-wont-alter-russian-crude-flows/), Hellenic Shipping News, 2026-10-23 7. [Iran Ships Some LPG, Jet Fuel Despite US Blockade, Data Shows](https://gcaptain.com/iran-ships-some-lpg-jet-fuel-despite-us-blockade-data-shows/), gCaptain, 2026-10-16 8. [The Blockade on Iran Is Now Hitting Home](https://maritime-executive.com/article/the-blockade-on-iran-is-now-hitting-home), The Maritime Executive, 2026-10-19 9. [Topological Resilience of Shipping Alliances in Maritime Transportation Networks](https://doi.org/10.3390/logistics9010006), Logistics (Multidisciplinary Digital Publishing Institute), 2025-01-03 ## More on this topic The question suppliers keep asking is what the Iran blockade shipping situation changes for a normal port call. The short answer is paperwork and counterparty checks, not the end of trade. Enforcement is reported as near-total on Iranian ships and ports, yet Iran still moved some LPG and jet fuel since July. Meanwhile sanctions are easing on other files, with General License 135 issued on 9 October. For chandlers, bunker suppliers and agents, that mix means screening the vessel, owner, manager and charterer before quoting, reading recent port calls for gaps, and keeping a dated record of the decision. Bunker demand also shifts between ports as routes change. What is a naval blockade? A naval blockade stops ships entering or leaving specified ports, and it redirects trade rather than ending it. Cargoes reroute and vessels arrive with incomplete documentation, so port-call work becomes compliance work. What sanctions is Iran under, and is anything easing? Enforcement widened through October 2026, while the US Treasury issued General License 135 on 9 October as part of a run of sanctions easing. That mix is why suppliers screen the vessel, owner, manager and charterer before quoting, and keep a dated record of the decision. --- VesselReach, built by CatalystIQ. CatalystIQ Data Classification and Analysis Services, Al Qusais, Dubai, P.O. Box 129882, United Arab Emirates. info@catalystiq.ae, +971 58 599 7894. Book a demo: https://vesselreach.si/#demo. Pricing: contact us for a quote (https://vesselreach.si/pricing).