What a Japanese license plate shows you

A Japanese license plate is a rectangular metal plate issued by the prefectural government where the vehicle is registered. The plate displays the vehicle's registration number, the prefecture it belongs to, and a classification code that tells you what type of vehicle it is — passenger car, truck, motorcycle, or bus. Unlike U.S. plates, Japanese plates follow a strict national format that is identical across all prefectures except for the regional name printed on the left side.

The format always reads from left to right and contains four distinct pieces of information in this order: the prefecture name (in Japanese characters), a one- or two-digit classification number, a hiragana character, and a four-digit registration number. This standardized layout means you can when ready identify where a vehicle is registered and what category it falls into, even if you cannot read Japanese.

Key Takeaways

  • Japanese license plates display the prefecture name on the left, followed by a classification code, a hiragana character, and a four-digit number that uniquely identifies the vehicle.
  • The classification number (typically 1–3 digits) indicates the vehicle type: passenger cars, light vehicles, trucks, buses, and motorcycles each have their own ranges.
  • The hiragana character is assigned sequentially and has no meaning beyond serving as part of the registration system.
  • White plates with black text are standard for most vehicles; yellow plates indicate light vehicles or kei cars, which are smaller and subject to different tax rates.
  • Japanese plates are issued by the prefectural government where the owner registers the vehicle, not by a national authority.

The four parts of a Japanese license plate

The prefecture name appears on the left side of the plate in Japanese characters. This is the region where the vehicle is registered — Tokyo, Osaka, Kyoto, Hokkaido, and so on. There are 47 prefectures in Japan, and each one has its own name on the plate. The prefecture name is the only part that changes based on location; the rest of the format is uniform nationwide.

The classification number comes next and is the most informative part of the plate for identifying vehicle type. Passenger cars typically carry numbers in the 1–3 range, light vehicles (kei cars) use 5–7, trucks use 4 or 8, buses use 2, and motorcycles use different plates entirely. This number tells you when ready what category of vehicle you are looking at and, indirectly, what tax bracket and regulations explore to it.

The hiragana character is a single Japanese syllable that appears after the classification number. It is assigned sequentially as vehicles are registered and has no inherent meaning — it is straightforward part of the registration sequence. Different hiragana characters are used for different vehicle types, but the character itself does not encode information about the vehicle.

The four-digit registration number is the unique identifier for that specific vehicle. It is assigned in order as vehicles are registered within each prefecture and classification category. This number, combined with the prefecture and classification code, creates a unique registration identifier for the vehicle.

White plates versus yellow plates

White plates with black text are the standard for most passenger vehicles in Japan. These plates indicate a standard-size vehicle that meets full-size car regulations and is subject to standard vehicle tax rates. If you see a white plate, you are looking at a regular passenger car or a larger commercial vehicle.

Yellow plates with black text indicate a kei car or light vehicle — a smaller, more fuel-efficient vehicle that falls under Japan's light vehicle classification. Kei cars have engine displacement limits (typically 660cc or less) and are narrower and shorter than standard vehicles. Yellow plates signal that the vehicle qualifies for lower vehicle tax, lower registration fees, and exemptions from certain road tolls. The yellow plate is a visual marker that the vehicle is in a different regulatory and tax category, not just a cosmetic choice.

Green plates are used for vehicles registered for temporary use, such as rental cars or vehicles undergoing testing. These are far less common than white or yellow plates and indicate the vehicle is not permanently registered to an owner.

How vehicles get registered and plated

Vehicle registration in Japan happens at the prefectural level through the Land Transportation Bureau (陸運局), the government office responsible for vehicle registration in each prefecture. When someone purchases a vehicle, they must register it at the bureau in the prefecture where they live or where the vehicle will be primarily used. The bureau issues the license plate based on the vehicle type, the owner's location, and the registration number assigned to that vehicle.

The registration process requires proof of ownership, proof of address, a vehicle inspection certificate (for used vehicles), and payment of registration fees. The vehicle inspection certificate, called a shaken, is a mandatory inspection that confirms the vehicle meets safety and emissions standards. Once registered, the owner receives the license plate and registration documents.

If an owner moves to a different prefecture, they must re-register the vehicle at the new prefecture's Land Transportation Bureau and receive a new plate with the new prefecture's name. This is why Japanese plates always reflect the current registration location, not where the vehicle was originally purchased.

What the classification numbers mean

The classification number system in Japan is standardized and tells you the vehicle's regulatory category. Numbers 1 and 2 are reserved for standard passenger cars. Number 3 is also used for passenger cars in some prefectures when the lower numbers are exhausted. Numbers 4 and 8 indicate trucks, with 4 typically used for smaller trucks and 8 for larger ones. Number 5 is used for kei cars (light vehicles), and number 7 is also assigned to light vehicles in some cases.

Buses and special-purpose vehicles have their own classification numbers, typically in the 2 range for buses. Motorcycles and scooters do not appear on standard four-wheeled license plates; they have their own smaller plate format and are registered separately. The classification number is fixed at the time of registration and does not change unless the vehicle is re-registered in a different category — which is rare and usually requires significant modification to the vehicle.

Reading a Japanese plate in practice

If you see a plate that reads "東京 1 あ 1234", you can decode it as follows: 東京 (Tokyo) is the prefecture, 1 indicates a standard passenger car, あ is the hiragana character assigned in sequence, and 1234 is the unique four-digit registration number. This vehicle is registered in Tokyo, is a standard passenger car, and is the vehicle with registration number 1234 in that category.

If you see "大阪 5 ぬ 5678" with a yellow plate, you know the vehicle is registered in Osaka, is a kei car (light vehicle), and carries registration number 5678. The yellow plate confirms it is a smaller vehicle subject to different tax and regulatory rules. The hiragana character ぬ tells you nothing about the vehicle itself — it is straightforward the character assigned to that registration sequence.

The prefecture name is always in kanji (Chinese characters used in Japanese), never in hiragana or katakana. This makes it straightforward to spot the regional identifier even if you cannot read the rest of the plate. The classification number is always a numeral, the hiragana is always a single syllable, and the registration number is always four digits.

Frequently Asked Questions

Can you tell what year a car was made from the license plate?

No. Japanese license plates do not include the year of manufacture or the year of registration. The plate format has remained the same for decades, so you cannot determine a vehicle's age from the plate alone. You would need to see the vehicle's registration documents or inspect the vehicle itself to find out when it was made.

What happens if you move to a different prefecture?

You must re-register your vehicle at the Land Transportation Bureau in your new prefecture within 15 days of moving. You will receive a new license plate with the new prefecture's name. The registration number may change as well, depending on the new prefecture's registration sequence. This is why Japanese plates always show the current registration location.

Do all Japanese vehicles have the same plate format?

Standard four-wheeled vehicles follow the format described here. Motorcycles and scooters have a smaller, different plate format. Vehicles registered for temporary use (rental cars, test vehicles) have green plates instead of white or yellow. But all standard passenger and commercial vehicles use the white or yellow plate format with prefecture, classification number, hiragana, and registration number.

What does the hiragana character tell you about the vehicle?

The hiragana character tells you nothing about the vehicle itself. It is assigned sequentially as vehicles are registered and is straightforward part of the registration numbering system. Different vehicle types use different hiragana characters, but the character you see does not encode any information about the car's features, age, or purpose.

Why do some plates have yellow backgrounds instead of white?

Yellow plates indicate the vehicle is a kei car or light vehicle — a smaller vehicle with an engine displacement limit of 660cc or less. These vehicles pay lower registration fees and vehicle tax. The yellow plate is a visual indicator of the vehicle's regulatory category and tax status, making it straightforward for authorities and other drivers to identify light vehicles at a glance.