Area Code 1238 – Kuriyama, Hokkaido

Overview of Area Code 1238

Area code 1238 is a geographic National Destination Code (NDC) assigned to the town of Kuriyama in the Yūbari Subprefecture of Hokkaido, Japan. This code is part of the Japanese numbering plan administered by the Ministry of Internal Affairs and Communications (MIC) and the Telecommunications Carriers Association (TCA). The region is served by the Nippon Telegraph and Telephone East (NTT East) network, which provides PSTN and ISDN services. Kuriyama is a rural town known for its agricultural production, particularly rice and melons, and is located approximately 30 kilometers east of Sapporo, the prefectural capital.

Geographic Coverage and Administrative Jurisdiction

The 1238 area code covers the administrative area of Kuriyama Town, which includes the central urban area and surrounding rural districts. It is bordered by the area codes 0123 (Iwamizawa) and 0145 (Yūbari). The town is part of the Sorachi Subprefecture, but the telephone exchange is grouped under the Yūbari regional calling area. The code is used exclusively for fixed-line services, including traditional analog lines, ISDN, and fiber-optic (FTTH) services provided by NTT East and other competitive local exchange carriers (CLECs) that have been assigned numbers in this NDC.

Dialing Formats and Caller Instructions

For local callers within the same area code, the national subscriber number is typically 7 digits, and local calls are made by dialing the 7-digit number without the area code. However, for calls from outside the 1238 area, the full national format is 0-1238-XXXXXXX. For example, to call a Kuriyama number from Tokyo, you would dial 0-1238-45-6789. International callers must use the country code for Japan (+81) and omit the leading zero, resulting in +81-1238-45-6789. It is important to note that the area code is not optional when dialing from a mobile phone or from a different region, as the network uses the prefix to route the call to the correct exchange.

Overlay and Numbering Considerations

As of the latest data, there is no overlay code for the 1238 area. The numbering capacity is sufficient for the population density, and no changes are anticipated in the near future. However, with the ongoing migration from PSTN to IP-based services, some numbers in this range may be used for VoIP services, but the geographic significance remains. When dialing from overseas, it is essential to replace the international access code (e.g., 011 from the US) with the appropriate exit code, and then dial +81-1238-XXXXXXX. For callers within Japan, using a carrier selection service (e.g., 001, 0033) may alter the dialing sequence, but the standard format remains as described.

Practical Examples

• Local call (within Kuriyama): 45-6789
• National call (from Tokyo): 0-1238-45-6789
• International call (from the US): 011-81-1238-45-6789
• International call (from the UK): 00-81-1238-45-6789

Understanding these dialing protocols ensures seamless connectivity to businesses and residents in Kuriyama, Hokkaido.