Area Code 1582 – Monbetsu, Hokkaido

Overview of Area Code 1582

Area code 1582 is a geographic National Destination Code (NDC) within the Japanese telephone numbering plan, assigned to the city of Monbetsu (紋別) and its surrounding administrative district in the Okhotsk Subprefecture of Hokkaido. This code is used for fixed-line (PSTN) services and is administered under the ITU-T E.164 country code +81. The numbering area covers Monbetsu City, the town of Omu, and the village of Takinoue, as well as smaller coastal communities along the Sea of Okhotsk.

Geographic Coverage and Jurisdiction

The 1582 area code serves the northern coastal region of Hokkaido, an area known for its fishing industry and winter ice floes. The primary city, Monbetsu, is the administrative and economic center of the region. The coverage area is defined by the Ministry of Internal Affairs and Communications (MIC) and includes the following municipalities:

• Monbetsu City (紋別市)
• Omu Town (雄武町)
• Takinoue Town (滝上町)

This is a geographically isolated region, and the area code is essential for routing calls within this part of Hokkaido.

Dialing Formats

For local callers within the 1582 area code, the national trunk prefix 0 is used, followed by the area code and the subscriber number. The full national number is 0-1582-X-XXXX, where X-XXXX is the 5-digit subscriber number (total 10 digits including the trunk prefix). For example, a local call to a business in Monbetsu would be dialed as 01582-3-4567.

For international callers, the Japanese country code +81 is used, and the leading 0 of the area code is dropped. The international format becomes +81-1582-X-XXXX. For instance, a caller from abroad would dial +81158234567 to reach the same number.

Overlay and Numbering Considerations

As of the latest MIC updates, area code 1582 does not have an overlay code. The subscriber number length is fixed at 5 digits, making the total number length 10 digits when including the trunk prefix. This is consistent with Japan's closed numbering plan, where all numbers are 10 digits nationally (excluding the country code).

Caller Instructions

• Local callers within the 1582 area can dial the 5-digit subscriber number directly or use the full national format; however, it is standard practice to dial the full 10-digit number to avoid confusion.
• Domestic callers from other parts of Japan must dial 0-1582-X-XXXX.
• International callers must dial +81-1582-X-XXXX, omitting the leading zero.

This area code is exclusively geographic and does not support non-geographic services. For any numbering plan changes, subscribers should consult the official MIC announcements.