Area Code 2571 – Muika, Niigata

Overview of Area Code 2571

Area code 2571 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Muika (六日町) and its surrounding administrative district in Minamiuonuma City, located in Niigata Prefecture (新潟県). This code is part of the historic Niigata numbering area and is used exclusively for fixed-line PSTN services. The prefix is governed by the Ministry of Internal Affairs and Communications (MIC) and administered by Nippon Telegraph and Telephone (NTT) East, following the ITU-T E.164 international standard.

Geographic Coverage and Jurisdiction

The 2571 area code serves Muika, a central urban area of Minamiuonuma City, along with adjacent towns and villages within the former Muika district. This region is located in the southern part of Niigata Prefecture, approximately 150 kilometers northwest of Tokyo. The area is known for its mountainous terrain, ski resorts, and the Uonuma rice-producing region. The code covers a mix of residential, commercial, and administrative zones, including the Minamiuonuma City Hall and local business districts.

Dialing Formats and Instructions

For local callers within the 2571 area code, the subscriber number is seven digits long. The complete national dialing format is 02571-X-XXXX, where X represents the first digit of the subscriber number. However, when dialing from a phone within the same area code, the trunk prefix '0' and the area code are typically omitted, and only the seven-digit subscriber number is dialed. For example, a local call to a number such as 123-4567 would be dialed as 123-4567.

For callers from other regions within Japan, the full national format is required: 02571-123-4567. International callers must use the country code for Japan (+81) and drop the leading '0', resulting in +81 2571-123-4567. When dialing from a mobile phone, the same national format applies, and the area code is always required unless the number is stored with the +81 prefix.

Overlay and Numbering Considerations

As of the latest MIC data, there is no overlay code for the 2571 area. The area code remains a standalone geographic code, and ten-digit dialing is not required for local calls. However, callers should be aware that due to number portability, a fixed-line number with this area code may be routed to a VoIP service or a different physical location. For international callers, it is essential to use the correct exit code from their country (e.g., 011 from the US) followed by 81 and the area code without the leading zero.

Practical Examples

• Local call (within 2571): Dial 123-4567
• National call (from Tokyo): Dial 02571-123-4567
• International call (from the US): Dial 011 81 2571-123-4567
• International call (from the UK): Dial 00 81 2571-123-4567

Understanding these dialing rules ensures seamless connectivity for both residents and businesses operating in the Muika region.