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Lot Number to Address (地番から住所)

You have a 地番 from a registry record or a contract, and you want to know where the parcel actually is. Enter the municipality, the 大字 and the lot number: this shows the parcel on the map and the residential address block it sits in. Free, no signup.

Write it the way the registry does: prefecture, municipality, 大字, then the 地番. The lot number alone is not enough: the same number repeats in every municipality.

Try an example:

Two numbering systems, set by two different bodies

The 地番 is assigned by the registry office to each parcel of land, and it is what every land record is keyed on: the Real Property Registration Act defines it as the number given to each parcel, makes it one of the required particulars of a land registration, and requires the registry map to show it.[1] The 住居表示 address is a separate thing entirely. Under the Act on Residential Indication, a municipality assigns it by resolution of its own assembly, for built-up areas it defines itself, using a town or 字 name plus a block symbol (街区符号) and a building number (住居番号).[2] Different body, different purpose, no formula connecting the two.

Why we show you the block, not the building number

The 住居番号 is attached to a structure, not to land.[2] It is recorded by the municipality, not in the cadastre, so no parcel dataset contains it and none can derive it. What can be answered from open data is which town and which block the parcel falls in: this tool resolves the parcel outline, then reports the nearest official address reference point from the national 位置参照情報 dataset.[3]

When the 地番 already is the address

Residential indication is not nationwide. A municipality implements it only for built-up areas it has resolved to cover,[2] which leaves most rural, mountain, and resort Japan outside it. In those places there is no 住居表示 to find, and the 地番 is what post, utilities, and the registry all run on. A result that reports no residential address is an answer, not a gap in our data.

Buildings carry a third number

If you are chasing a 家屋番号, that is a separate identifier again. A building registration records the 地番 of the land the building stands on and gives the building its own 家屋番号.[1] So a building record is reached through the land 地番, which is what this tool resolves. The number itself comes from the registry record, which you can order from the Legal Affairs Bureau online.[4]

Data coverage

Parcel outlines come from the 2026 national lot-number dataset, over 100 million parcels across all 47 prefectures. Residential-address reference points come from the 位置参照情報 dataset published by the Ministry of Land, Infrastructure, Transport and Tourism. Coverage is strong in suburban, rural, and resort areas, and thinner in dense city centres.

Questions

Can I get a street address from a lot number?

You can get the town and the block. In an area that runs 住居表示, this tool names the 町名 and 街区符号 the parcel sits in. The 住居番号, the last number, the one on the building, is assigned per structure by the municipality and is in no cadastral dataset, so it cannot be derived from a 地番.

Why do I need the municipality and district, not just the number?

Lot numbers are only unique within a 地番区域, so the same number exists in every municipality in Japan, and often in several 大字 of one municipality. Without the municipality there is nothing to search; without the district the answer can be ambiguous, and the tool will ask you which one you meant.

The tool says there is no residential address. Is it broken?

No. Most of rural and resort Japan has never implemented 住居表示, because a municipality only does so for built-up areas and only by resolution of its assembly. Where it has not, the 地番 is the address in everyday use.

My lot number is not found. What happened?

Lot numbers change. A parcel that is split gets new numbers (分筆) and merged parcels are consolidated under one (合筆), so a number taken from an older document may no longer exist. Cadastral map coverage is also uneven, and is thinnest in dense city centres. Confirm the current number against the registry record.

Is this tool free?

Yes. The lookup is free and needs no account. Ordering the official registry record for a parcel is a paid service, because the record itself is purchased from the Legal Affairs Bureau.

Sources

  1. [1]法務省 / e-Gov 法令検索, 不動産登記法（平成十六年法律第百二十三号）
  2. [2]総務省 / e-Gov 法令検索, 住居表示に関する法律（昭和三十七年法律第百十九号）
  3. [3]国土交通省, 位置参照情報ダウンロードサイト
  4. [4]法務省, 登記・供託オンライン申請システム

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