Free tool — no account needed
Japan Lot Number (地番) Lookup
Enter a Japanese address — or an English town name like Karuizawa — and get the 地番, the parcel number the property registry is keyed on. Free, no signup, powered by the 2026 national lot-number dataset.
Why the address is not the lot number
Japan runs two parallel address systems. The 住居表示 address on a building plate is for finding the door; the 地番 is the parcel identifier the legal registry is keyed on. They frequently disagree, which is why an address alone will not get you a registry record.
Coverage
Parcel geometry comes from the 2026 法務局 lot-number dataset — over 100 million parcels across all 47 prefectures. Coverage is strong in suburban, rural, and resort areas and patchier in dense city centres.
Questions
Is the lot number the same as the address?
No. Japan runs two parallel systems: the 住居表示 address for finding a building, and the 地番 parcel number that the legal registry (登記簿) is keyed on. They often differ, which is why you cannot order a registry record with a street address alone.
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 is purchased from the Legal Affairs Bureau.
Why does my address return no parcel?
Cadastral map coverage in Japan is uneven. Suburban, rural, and resort areas are well covered; dense city centres and 地図混乱地域 often are not. Where no polygon exists, the registry record is the reliable route to the 地番.
How accurate is the result?
The tool resolves your address to an official reference point, then returns the parcel that point falls inside. It is a research shortcut, not a legal document. Always confirm ownership, area, and rights against the registry record.