Area Code 423 – Makale/Rantepao

Overview of Area Code 423 (Makale/Rantepao)

Area code 423 is a geographic National Destination Code (NDC) assigned to the Makale and Rantepao regions in the province of South Sulawesi (Sulawesi Selatan), Indonesia. These towns serve as the administrative and cultural centers of Tana Toraja and North Toraja (Toraja Utara) regencies, respectively. The code covers the Toraja highlands, a popular destination for its unique funeral rites and traditional tongkonan houses.

Geographic Coverage and Administrative Jurisdiction

The 423 area code encompasses the following key areas:

• Makale: Capital of Tana Toraja Regency.
• Rantepao: Capital of North Toraja Regency.
• Surrounding districts within both regencies, including Sangalla, Mengkendek, and Sesean.

This code is used for fixed-line (PSTN) services, including traditional copper lines and some fixed wireless or VoIP services that are geolocated to these areas.

Dialing Formats

Understanding the correct dialing sequence is crucial for both domestic and international callers.

• Domestic (within Indonesia): To call a fixed line in Makale or Rantepao from other parts of Indonesia, dial 0-423-XXXXXXX. The leading '0' is the trunk prefix used for domestic long-distance calls.
• International (from outside Indonesia): To reach a number in this region from abroad, dial your country's international access code (e.g., 00, 011), followed by Indonesia's country code 62, then the area code 423 (without the leading '0'), and finally the local subscriber number. For example, if the local number is 123456, you would dial +62 423 123456.

Local Numbering Details

Local subscriber numbers in the 423 area code typically consist of 6 to 7 digits. The total length of a domestic number (including the trunk prefix '0' and area code) is 10 to 11 digits. When dialing locally within the same area code, callers may often omit the area code and dial only the subscriber number, depending on the specific network configuration. However, for clarity and to avoid misdialing, it is recommended to use the full domestic format.

Overlay and Numbering Plan Considerations

As of the latest ITU-T E.164 national numbering plan updates, there is no overlay code for the 423 area. The code is exclusively assigned to the Makale/Rantepao geographic region. However, with the increasing adoption of VoIP and mobile services, some subscribers may have ported their fixed-line numbers to other platforms, but the geographic significance of the code remains unchanged for routing purposes.

Caller Instructions

• Local callers within the 423 area can dial the 6-7 digit subscriber number directly.
• Domestic callers from other Indonesian cities must include the trunk prefix '0' and the area code: 0-423-XXXXXXX.
• International callers must replace the trunk prefix '0' with the +62 country code and drop the leading '0' of the area code: +62 423-XXXXXXX.

Always verify the number length with your contact, as some older lines may have fewer digits.