Area Code 287 – Kebumen/Karanganyar

The area code 287 is a geographic National Destination Code (NDC) within the Indonesian numbering plan, allocated to the southern part of Central Java. Specifically, it serves the regencies of Kebumen and Karanganyar (the latter being a distinct administrative region from the city of the same name near Solo). This code is used for fixed-line (PSTN) services, including traditional copper lines and, increasingly, fixed wireless and VoIP-based local access.

Geographic Coverage and Administrative Jurisdiction

Code 287 covers the following areas:

• Kebumen Regency – including the town of Kebumen and surrounding districts.
• Karanganyar Regency – a separate regency located to the east, not to be confused with Karanganyar district in Surakarta (which uses code 271).

These regencies are part of the Kedu and Surakarta residencies historically, but today they fall under the Central Java province. The code is assigned to the local telecommunication operator, primarily Telkom Indonesia, which provides local exchange services.

Dialing Formats

For local calls within the same area code (e.g., from Kebumen to Karanganyar), subscribers typically dial the 7-digit subscriber number directly, omitting the area code. However, for calls from other regions in Indonesia, the format is:

• National dialing: 0 287 XXX XXXX (where XXX XXXX is the 7-digit local number).
• International dialing: +62 287 XXX XXXX (drop the leading 0).

For example, a fixed line in Kebumen might be +62 287 123 4567. When calling from abroad, you must replace the leading zero with the country code +62.

Overlay and Numbering Considerations

Currently, there is no overlay code for 287; it remains a standalone geographic code. The number length is fixed at 7 digits after the area code, following the Indonesian national numbering plan (as per ITU-T E.164). This ensures that the total number of digits for a national significant number (NSN) is 10 digits (including the leading 0).

Caller Instructions

• Local callers within the 287 area should dial only the 7-digit subscriber number for local calls. For calls to other area codes, they must use the full national format with the trunk prefix 0.
• Domestic callers from outside the 287 area must dial 0287 followed by the subscriber number.
• International callers should dial +62 287 followed by the subscriber number, omitting the leading 0.

Understanding this prefix is essential for businesses establishing local presence in Kebumen or Karanganyar, as well as for individuals needing to reach fixed-line services in these regions. Always verify the subscriber number length, as some older lines may have fewer digits, but the standard is 7.