UOF is the independent logistics brand developed by Junjia International Logistics, a China-based logistics company established in 2000 and focused on China-Japan transportation for more than two decades. The company is headquartered in Shanghai and maintains operations in both China and Japan, with a network designed around cross-border parcel, freight, customs, warehousing and delivery services between the two countries.
UOF provides several transportation options for shipments from China to Japan, including air freight, ocean freight and small-package services. Its Japan air-freight service is used for documents, packages, personal shipments, commercial cargo and first-leg movements to overseas warehouses, while its ocean products include standard sea freight and faster services designed for customers seeking alternatives to air transportation.
The carrier also supports cross-border e-commerce logistics. UOF offers first-leg transportation to Japanese e-commerce fulfillment warehouses, including shipments destined for platforms such as Amazon, as well as Japanese overseas-warehouse services covering storage, order fulfillment, labeling and related warehouse operations. Its official network includes an Osaka office and warehouse facilities in the Osaka and Tokyo areas.
UOF additionally operates services in the opposite direction, including Japanese shopping-parcel forwarding from Japan to China. For these shipments, the company can provide a Japanese receiving address, consolidation or parcel splitting, repacking and customs-related handling. Customers can use UOF Tracking to follow supported shipments after they have entered the carrier's transportation system.
How UOF shipment tracking works
To Track a UOF shipment with 4Tracking, enter the UOF waybill number in the tracking field. 4Tracking can identify supported carrier references automatically; select UOF manually if necessary, press the Track button, and you will be redirected to the package tracking results page to view the available shipment updates.
UOF also provides a dedicated shipment Tracking page on its official website. The carrier asks customers to enter the waybill number associated with the shipment. Its tracking page also supports checking multiple shipments by entering each waybill number separately on a new line.
If a newly issued number does not immediately display Tracking information, verify that the complete waybill number has been entered correctly. If the shipment still cannot be located, the sender or UOF customer service can help confirm whether the correct shipment reference was supplied and whether the consignment has entered the trackable transportation process.
UOF tracking number formats
UOF officially refers to the shipment identifier used for online Tracking as a waybill number. However, the carrier does not publish a universal prefix, fixed length or complete letter-and-number pattern that can be safely applied to every UOF service.
Because UOF handles different types of parcels, air cargo, sea freight and e-commerce shipments, use the exact waybill number shown on the shipping documents or provided by UOF or the sender. Do not add characters or attempt to create a number from unofficial examples, as no single public tracking-number format has been confirmed by the carrier.
UOF delivery times and supported examples
Delivery time depends on the UOF service selected, the shipment's origin in China, its destination in Japan, customs processing and the final delivery arrangement. UOF therefore offers different transportation products rather than one standard transit time for every package.
One officially published example is UOF's Japan sea-freight e-commerce parcel service. The company states that these shipments can complete delivery in Japan in approximately 6–10 business days after the vessel departs. UOF describes this service as using fast vessels, Japanese e-commerce customs clearance and domestic delivery in Japan.
For that sea-parcel product, UOF states that final delivery can be assigned according to the package dimensions to Japanese delivery providers such as Sagawa Express, Yamato Transport or Japan Post. The published 6–10-business-day figure applies specifically to this service and should not be treated as a universal promise for UOF air freight, standard ocean freight, FBA transportation or other products.
UOF also offers Japan air freight and a special express sea service using a sea-to-air model, but its public service pages do not provide a sufficiently clear fixed day range that can be presented as a general delivery promise for those products. For the most relevant estimate, check the service selected when the shipment was booked and follow its package tracking updates.
How to contact UOF about shipment issues
If your UOF Tracking number is not working, a shipment appears delayed or you need more information about its current status, the carrier lists the customer-service hotline 400-848-1598 and the email address UOF@UOFEXP.COM on its official website.
UOF also publishes an international and domestic shipment inquiry telephone number at +86 21 64015910. Customers dealing with the company's Japanese operations can use the Japan customer-service hotline 03-6633-1188. The official company information lists its headquarters in Shanghai and its Japanese office in the Osaka area.
When contacting UOF about a shipment, provide the full waybill number, sender and recipient information where appropriate, the transportation service used and the latest visible Tracking status. These details can help customer service identify the shipment and investigate missing scans, customs questions, delivery delays or unsuccessful delivery attempts.
Frequently asked questions about UOF package tracking issues
Why is my UOF tracking number not working?
First confirm that you entered the complete waybill number exactly as it was provided. A shipment may also have limited Tracking information before it has entered the carrier's processing system. If the correct reference continues to return no result, contact UOF or ask the sender to confirm the waybill number.
What format does a UOF tracking number use?
UOF calls the reference used by its online tracker a waybill number, but the company does not publish a verified universal prefix, length or character pattern. Use the exact number provided with your shipment rather than relying on unofficial examples.
How can I Track a UOF package on 4Tracking?
Enter the UOF waybill number on 4Tracking, allow the system to detect the carrier or choose UOF manually when necessary, and press the Track button. The results page will display the available package tracking information for the shipment.
Can I Track multiple UOF shipments?
Yes. UOF's official shipment Tracking page supports multiple waybill queries and instructs users to place each waybill number on a separate line. This is useful when checking several UOF shipments at the same time.
How long does a UOF package from China to Japan take?
The transit time depends on the service. For UOF's Japan sea-freight e-commerce parcel product, the carrier publishes an example of approximately 6–10 business days after the vessel departs to complete delivery in Japan. Other UOF services have different schedules and should not be assumed to use the same timeframe.
Why has my UOF package tracking stopped updating?
International shipments can spend time between visible Tracking events while they are moving between China and Japan, traveling by air or sea, undergoing customs procedures or awaiting domestic delivery. If the delay becomes longer than the expected schedule for the service you purchased, contact UOF with the waybill number.
Does UOF provide delivery throughout Japan?
UOF's official service information describes its China-to-Japan express services as covering destinations throughout Japan. Its e-commerce sea-parcel service can also use Japanese domestic carriers for the final delivery stage, depending on the shipment.
Who should I contact if my UOF shipment is delayed or cannot be found?
Contact UOF customer service at 400-848-1598, use the shipment inquiry number +86 21 64015910, or email UOF@UOFEXP.COM . For assistance through the Japanese operation, UOF also publishes the Japan customer-service number 03-6633-1188. Provide your complete waybill number when requesting help.