Area Code 280 – West Cilacap

Overview of Area Code 280

Area code 280 is a geographic National Destination Code (NDC) within the Indonesian numbering plan, assigned to the western part of Cilacap Regency in Central Java. This code is used for fixed-line (PSTN) services and is administered under the country code +62. When dialing internationally, the full number format is +62 280 XXX XXXX, where the trunk prefix '0' is omitted. Domestically, callers must dial 0 280 XXX XXXX from outside the local area, or simply XXX XXXX for local calls within the same code.

Geographic Coverage and Jurisdiction

The 280 code serves the western districts of Cilacap Regency, including the administrative town of Cilacap and surrounding areas such as Cilacap Tengah, Cilacap Selatan, and Cilacap Utara. This region is part of the Banyumas Residency and is strategically located on the southern coast of Central Java, near the border with West Java. The area is known for its port and industrial activities, particularly the Pertamina oil refinery, which contributes to the demand for reliable fixed-line communications.

Dialing Formats and Instructions

• Local calls (within 280): Dial the 7-8 digit subscriber number directly, e.g., 123 4567.
• Domestic long-distance (from other Indonesian areas): Dial 0 280 followed by the subscriber number, e.g., 0 280 123 4567.
• International calls (from abroad): Dial your country's exit code, then 62 280, then the subscriber number, e.g., 00 62 280 123 4567.

For callers outside Indonesia, it is crucial to omit the leading '0' of the trunk prefix. For example, a caller from the United States would dial 011 62 280 123 4567.

Numbering and Overlay Considerations

Subscriber numbers in the 280 area typically consist of 7 to 8 digits, resulting in a total national significant number (NSN) length of 10 to 11 digits, including the NDC. As of the latest ITU-T E.164 guidelines, Indonesia maintains a closed numbering plan for fixed lines, meaning the full national number must be dialed for all calls, including local ones, when using mobile or VoIP services. However, within the same fixed-line exchange, abbreviated dialing may still be supported.

There are no overlay codes currently assigned to the 280 area, but the Indonesian Telecommunication Regulatory Authority (BRTI) has implemented number portability for fixed lines, allowing subscribers to retain their numbers when changing operators within the same geographic area.

Practical Guidance for Callers

For local callers within Cilacap, using the 280 code is straightforward. For international callers, ensure you have the correct country code and area code, and be mindful of time zone differences (UTC+7). If you encounter difficulties, confirm the subscriber number length, as some older lines may have fewer digits. For business purposes, it is advisable to verify the correct dialing format with your telecom provider to avoid misdialed calls.