Japan Post is Japan's national postal operator and one of the country's most important delivery networks, handling everything from everyday mail to domestic packages and international shipments. Operated by Japan Post Co., Ltd., the service reaches addresses throughout Japan through its nationwide post office network and connects Japanese senders with postal operators around the world. For online shoppers and businesses, Japan Post is especially familiar as the carrier behind many packages shipped from Japanese stores, marketplaces, proxy-buying services, and individual sellers.
For domestic deliveries, Japan Post offers several services suited to different package sizes and delivery needs. Yu-Pack is its main parcel service and supports packages up to 170 cm in combined length, width, and height and generally up to 25 kg, with tracking and delivery every day including weekends and holidays. Yu-Packet is designed for smaller packages up to 1 kg and can be posted through a mailbox or handed in at a post office, while services such as Letter Pack and registered mail provide additional choices for documents and smaller items.
Japan Post also operates a large international delivery network. Its best-known premium international service is EMS, or Express Mail Service, which is Japan Post's fastest international postal option and can carry documents and merchandise weighing up to 30 kg to more than 120 countries and territories where the service is available. International Parcel Post provides another option for overseas packages, while registered and insured international mail services are available for eligible items and destinations.
International shipping procedures have become more digital. Japan Post requires international shipping labels to be created through its International Mail My Page Service rather than using handwritten international labels. Availability can also change by destination because of transport capacity, customs requirements, local disruptions, or temporary service suspensions, so senders should check Japan Post's current country-specific service information before posting an international package.
How to track Japan Post packages
The easiest way to track a Japan Post package is through 4tracking.net. Enter your Japan Post tracking number in the tracking field and start the search. 4tracking is a universal package tracking service, which is useful when you receive packages from Japan as well as shipments handled by many other postal and courier companies. Available tracking events can show acceptance at a post office, movement through processing facilities, arrival at a delivery office, customs processing for international packages, an attempted delivery, delivery completion, or a return to the sender.
You can also track a package through Japan Post's official Track & Trace Service. Japan Post provides tracking for services including Yu-Pack, Yu-Packet, Letter Pack, registered mail, EMS, International Parcel Post, international registered mail, and insured international mail. On the current Japan Post tracking page, the tracking number should be entered without hyphens. Ordinary letters and postcards that were not sent with a trackable service cannot be tracked.
For international package tracking, updates are exchanged between Japan Post and the postal operator in the destination country. This means you may initially see scans from Japan showing acceptance, dispatch from an outward office of exchange, or export processing, followed later by customs and delivery events supplied by the destination postal service. Overseas information can occasionally take time to appear, and Japan Post notes that tracking information from some countries or territories may be incomplete or delayed.
If your package was purchased from an online store, use the tracking number supplied by the seller rather than the store's order number. A marketplace order ID and a Japan Post tracking number are different identifiers. If a newly issued number does not immediately show a result, the package may not yet have received its first acceptance scan.
Japan Post tracking number formats
Japan Post uses different tracking-number formats for domestic and international services. Its official domestic tracking page accepts inquiry numbers containing 11 to 13 characters after hyphens are removed. Many domestic Yu-Pack and other trackable items use numeric tracking numbers, so a number can look similar to 123456789012, while some other trackable postal items may use an 11-digit number such as 12345678901.
Trackable international mail uses a standardized 13-character format consisting of 2 letters + 9 digits + 2 letters. For a package originating in Japan, the final two letters are commonly JP, so an international tracking number may look like EE123456789JP, CP123456789JP, or another identifier with the same two-letter, nine-digit, two-letter structure. The letters at the beginning vary according to the international postal service and item category.
Not every barcode printed on an international package is a trackable Japan Post number. Japan Post specifically warns that some barcode identifiers beginning with U, such as a number in the style of UL123456789JP attached to an ordinary small packet or customs declaration, may not be tracking barcodes. Likewise, identifiers that do not follow the recognized international tracking structure may not return package tracking information.
How long does Japan Post delivery take?
Japan Post delivery time depends heavily on the service, origin, destination, posting time, customs clearance, and current transport conditions. Domestic packages traveling between major areas of Japan are generally much faster than economy international services. Japan Post provides an official delivery-time calculator for domestic mail and packages because the expected date can change depending on the exact origin and destination postal codes.
For a useful domestic example, Japan Post states that Yu-Packet packages are generally delivered around the day after posting or the following day. A Yu-Packet posted on Monday on a normal route could therefore typically arrive on Tuesday or Wednesday. For distant destinations and certain islands, however, Japan Post says Yu-Packet delivery may take several days and in some cases around one week because the service is transported without using aircraft.
International EMS delivery varies considerably by country. Japan Post's published standard EMS estimates from Tokyo give practical examples: a package from Tokyo to Singapore is approximately 2 days, Tokyo to Germany around 5 days, Tokyo to the United Kingdom around 5 days, Tokyo to France around 6 days, Tokyo to Vancouver in Canada around 6 days, and Tokyo to Indonesia around 8 days. These figures do not include the day the EMS package is posted.
Those international estimates are not guarantees. Customs inspections, weekends and public holidays, destination areas far from major cities, airport security checks, limited transportation capacity, cancelled flights, severe weather, and postal disruptions can extend delivery times. Japan Post also publishes current international service notices, so a destination experiencing a temporary delay can take significantly longer than its normal EMS estimate.
Understanding Japan Post tracking updates
A first tracking scan usually confirms that Japan Post has accepted the package. Domestic packages can then show movement through one or more postal processing facilities before arriving at the post office responsible for final delivery. When the status indicates that the package is out for delivery, it has generally been assigned for delivery to the recipient that day, although an unsuccessful attempt can result in the package being taken back to the local post office.
International tracking normally contains additional stages. A package may be processed at an international exchange office in Japan, dispatched overseas, received by the destination country's postal network, presented to customs, released from customs, and finally transferred to a local delivery office. It is normal for there to be a gap between the export scan in Japan and the first scan in the destination country, especially while the package is in international transportation.
If tracking stops updating for a short period, it does not automatically mean the package is lost. Japan Post states that tracking history is updated when packages reach relevant postal facilities, while information may take time to appear during transportation. For international packages, time-zone differences and delayed data exchanges with overseas postal operators can also affect the apparent order or timing of tracking events.
How to contact Japan Post about a package
If you have a problem with a domestic Japan Post package, first check the latest tracking result and any delivery notice left at the address. Japan Post's Customer Service Center can assist with mail and package questions. From a fixed telephone line in Japan, the toll-free number is 0120-23-28-86. From a mobile phone, the number is 0570-046-666 and call charges apply. English-language assistance is available at 0570-046-111, also as a chargeable call. The current listed service hours for these package inquiries are daily from 8:00 to 21:00.
If an attempted delivery was made, you can also request redelivery through Japan Post's online redelivery service using the tracking or notification number printed on the delivery notice. If the package belongs to an online purchase, it is also a good idea to contact the seller or sender, particularly when the address, declared contents, customs documents, or shipping service may need to be confirmed.
For eligible international mail that appears to be missing, a formal investigation may require action by the sender. Japan Post states that an investigation for international Registered Mail, Insured Mail, or International Parcel Post can be requested within six months of the posting date. The inquiry request must be submitted at the same post office or branch where the item was originally posted, and Japan Post does not accept that formal investigation request by telephone. Keep the mailing receipt and tracking number because they are important when asking Japan Post to investigate an international package.
Frequently asked questions about Japan Post package tracking issues
Why is my Japan Post tracking number not working?
The package may not have received its first acceptance scan yet, or you may be entering an order number instead of the Japan Post tracking number. Check the shipping receipt, label, or seller's shipping confirmation and enter the number without hyphens. For international mail, a valid trackable identifier normally contains two letters, nine digits, and two final letters.
Why has my Japan Post package tracking stopped updating?
A package can continue traveling even when no new tracking event appears. Domestic tracking may remain unchanged while the package is moving between postal facilities, while international packages often have a longer gap between dispatch from Japan and arrival in the destination country's postal network. Customs processing and delayed data exchange with an overseas postal operator can also create gaps.
Why does Japan Post tracking show dispatch from an outward office of exchange for several days?
This normally means the international package has completed an export-processing stage in Japan and is moving toward the destination country. The next visible event may not appear until the destination postal operator receives and scans the package. Flight availability, transfers, customs procedures, weekends, and current international transport conditions can make this stage last longer than expected.
My Japan Post package says delivered, but I did not receive it. What should I do?
Check with household members, reception staff, building management, or anyone else who may have received the package. Confirm that the delivery address on the order is correct. If the package still cannot be located, contact the local Japan Post office or Customer Service Center with the tracking number. For an online purchase, notify the seller as well so they can assist with the delivery investigation.
Can I track every package sent through Japan Post?
No. Package tracking is available only for services that include tracking, such as Yu-Pack, Yu-Packet, Letter Pack, registered services, EMS, International Parcel Post, and certain other trackable products. Ordinary letters and postcards without a tracking service cannot be followed through the Japan Post tracking system.
Why does my international Japan Post tracking number end in JP?
The final two letters in a standardized international postal tracking number identify the postal administration that issued the number. Packages whose international tracking identifiers were issued in Japan commonly end in JP. The complete trackable international format contains two letters, nine digits, and two final letters.
How long should I wait for a Japan Post EMS package?
Use Japan Post's destination-specific estimate rather than assuming one delivery time for every country. For example, published standard EMS times from Tokyo are approximately 2 days to Singapore, 5 days to the United Kingdom or Germany, 6 days to France or Vancouver, and 8 days to Indonesia. Customs, holidays, remote destinations, transportation disruptions, and current service restrictions can make the actual delivery longer.
Can I track Japan Post packages on 4tracking?
Yes. Enter your Japan Post tracking number on 4tracking.net to track the package and view available delivery updates. 4tracking supports many postal and courier companies, making it convenient when you receive packages from Japan and shipments from other countries and carriers through one package tracking service.
What should I do if an international Japan Post package appears lost?
Check tracking first and confirm that the normal delivery estimate has been exceeded. The sender should then contact the post office where the package was mailed. For eligible international Registered Mail, Insured Mail, and International Parcel Post, Japan Post allows a formal investigation request within six months of posting and requires the request to be submitted through the post office or branch where the item was originally sent.
Monthly Delivery Performance for Japan Post – August 2026
Our comprehensive monthly delivery report for Japan Post in August 2026 is based exclusively on shipments confirmed as delivered, detailing the fastest, average, and slowest transit times from origin to destination. Shipments still in transit are excluded to ensure accurate and reliable insights.
| From | To | Delivery Time |
|---|---|---|
 CHNChina |  JPNJapan |
|
| JPN Japan |  UnknownUnknown |
|
 INDIndia | JPN Japan |
|
 IDNIndonesia | JPN Japan |
|
 THAThailand | JPN Japan |
|
| JPN Japan | CHN China |
|
| JPN Japan |  HKGHong Kong |
|
| JPN Japan | THA Thailand |
|
| JPN Japan |  USAUnited States |
|
| JPN Japan |  MEXMexico |
|
| HKG Hong Kong | JPN Japan |
|
 VNMVietnam | JPN Japan |
|
 TWNTaiwan | JPN Japan |
|
| JPN Japan | TWN Taiwan |
|
 KORSouth Korea | JPN Japan |
|