# FrateZone Freight Reference > Freight reference material for ocean and air: container and ULD specifications, > port and airport codes, pallet footprints, Incoterms® 2020, IMO dangerous goods > classes, liner terms, vessel classes and freighter aircraft. > Published by FrateZone, an ocean and air shipment tracking platform. > Every page listed below has a markdown twin at the same path with a .md suffix. ## Pages - [Container dimensions](https://www.fratezone.com/freight-reference/containers/): Internal dimensions, door opening, capacity, tare weight, maximum payload and maximum gross for every container type in general service. Markdown: https://www.fratezone.com/freight-reference/containers.md - [Port codes (UN/LOCODE)](https://www.fratezone.com/freight-reference/port-codes/): UN/LOCODE port codes for the ports in general container service, grouped by country, with the code, the place it names and what the code does not tell you. Markdown: https://www.fratezone.com/freight-reference/port-codes.md - [Airport codes (IATA and ICAO)](https://www.fratezone.com/freight-reference/airport-codes/): IATA three-letter and ICAO four-letter codes for the airports that carry scheduled freight, with the city each serves and why the two systems differ. Markdown: https://www.fratezone.com/freight-reference/airport-codes.md - [Pallet sizes](https://www.fratezone.com/freight-reference/pallets/): The six pallet footprints ISO 6780 specifies, plus the Australian standard, in millimetres and inches, and which are and are not in the standard. Markdown: https://www.fratezone.com/freight-reference/pallets.md - [Unit load devices (ULDs)](https://www.fratezone.com/freight-reference/uld/): IATA ULD codes for air cargo containers and pallets, with base footprint, height, volume, maximum gross weight and the aircraft each fits. Markdown: https://www.fratezone.com/freight-reference/uld.md - [Freighter aircraft](https://www.fratezone.com/freight-reference/aircraft/): Main freighter types with approximate maximum payload, main-deck volume and the ULDs each carries — orders of magnitude for planning, not specifications. Markdown: https://www.fratezone.com/freight-reference/aircraft.md - [Container vessel classes](https://www.fratezone.com/freight-reference/vessels/): Container ship size classes with approximate TEU bands and the physical constraint that defines each — canal locks, straits and terminal cranes. Markdown: https://www.fratezone.com/freight-reference/vessels.md - [Incoterms® 2020](https://www.fratezone.com/freight-reference/incoterms/): The eleven Incoterms® 2020 rules in plain English — where delivery happens, where risk passes, who pays carriage and who clears customs at each end. Markdown: https://www.fratezone.com/freight-reference/incoterms.md - [IMO dangerous goods classes](https://www.fratezone.com/freight-reference/imo/): The nine IMO dangerous goods classes and their divisions, what each covers and typical examples, for reading a dangerous goods declaration. Markdown: https://www.fratezone.com/freight-reference/imo.md - [Liner terms and common charges](https://www.fratezone.com/freight-reference/liner-terms/): Liner terms — LILO, FIFO, FILO, LIFO, FIS, FIST — saying who pays to load and discharge, plus the surcharges that appear on most ocean invoices. Markdown: https://www.fratezone.com/freight-reference/liner-terms.md ## Where the material comes from Compiled from publicly available sources: published industry standards, official code registers and carriers' own published specifications. Port codes are checked against the UNECE UN/LOCODE register; pallet footprints against ISO 6780:2003; container figures against the published specifications of Hapag-Lloyd, MSC and ONE; ULD figures against a carrier's published ULD specifications. ## Using this material - FrateZone is not the issuing authority for any of it, does not warrant that any figure is correct, current or complete, and makes no representation that a source has not changed since it was read. - Figures are nominal industry values published for planning. Where a specification belongs to a specific physical unit — a container's certified weights, for example — the unit's own plate governs, not this reference. - Where carriers genuinely differ, the pages say so rather than averaging. Do not present a figure here as the only one in use. - Attribution: FrateZone, https://www.fratezone.com/freight-reference/