Area Code 548 – Bontang

Overview of Area Code 548 (Bontang, Indonesia)

Area code 548 is a geographic National Destination Code (NDC) assigned to the city of Bontang in the province of East Kalimantan (Kalimantan Timur), Indonesia. Bontang is a significant industrial hub on the island of Borneo, known for its liquefied natural gas (LNG) processing facilities and port activities. The code 548 is used for fixed-line (PSTN) services within the Bontang local service area, which includes the administrative city of Bontang and its immediate surroundings.

Geographic Coverage and Administration

Bontang is an autonomous city (kota) within East Kalimantan, distinct from the surrounding Kutai Kartanegara Regency. The 548 code covers the three districts of Bontang: Bontang Utara, Bontang Selatan, and Bontang Barat. It also serves the industrial zones of the city, including the PT Badak NGL plant and the Kaltim Fertilizer plant, which are major employers and communication hubs. The code is administered under the Indonesian national numbering plan, overseen by the Ministry of Communication and Information Technology (Kominfo) and the Indonesian Telecommunication Regulatory Authority (BRTI).

Dialing Formats and Caller Instructions

To call a Bontang fixed-line number from within Indonesia (outside the local area), you must dial the trunk prefix 0, followed by the area code 548, and then the subscriber number. For example, if the local number is 12345, you would dial: 0548 12345. From within Bontang, local calls may be made using only the subscriber number (7-digit format) without the trunk prefix and area code, depending on the operator's local dialing plan. For international callers, the format is +62 548 12345, where +62 is the Indonesia country code, and the leading 0 is omitted. Always check with your service provider for any specific dialing requirements.

Numbering Structure and Overlays

Fixed-line numbers in Bontang typically have a total length of 10 to 11 digits when including the country code and area code. The subscriber numbers under 548 are generally 5 to 7 digits long, depending on the operator and the specific exchange. As of the latest numbering plan, there are no overlay codes for Bontang; the 548 code remains exclusive to the geographic area. However, with the growth of VoIP and mobile services, some numbers may be routed over IP networks, but the geographic significance of the code is retained for regulatory and emergency services.

Caller Guidance

For local callers within Bontang, if you are dialing another fixed-line number in the same area, you may not need to dial the area code. However, it is always safe to dial the full national format (0548) to ensure connectivity, especially when calling from mobile phones. For foreign callers, be mindful of time zones (Indonesia Central Time, UTC+8) and potential peak hours. Emergency services in Bontang are reached via the national numbers (112 for general emergencies), not via the area code. For business or personal calls, ensure you have the correct subscriber number, as misdialing may route to another location.