Area Code 357 – Pacitan

Geographic Overview and Jurisdiction

Area code 357 is a geographic National Destination Code (NDC) assigned to the Pacitan region, located in the province of East Java (Jawa Timur), Indonesia. This code covers the administrative regency of Pacitan (Kabupaten Pacitan) and its surrounding districts. Pacitan is situated on the southern coast of Java, bordered by the Indian Ocean, and is known for its coastal geography and karst landscapes. The code serves the fixed-line PSTN network within this jurisdiction, including the capital town of Pacitan and nearby sub-districts such as Ngadirojo, Sudimoro, and Punung.

Dialing Formats and Number Structure

When calling a fixed-line number in Pacitan from within Indonesia, subscribers must dial the trunk prefix 0, followed by the area code 357, and then the local subscriber number. The complete national format is 0-357-XXXXXXX, where the local number typically consists of 5 to 7 digits. For international callers, the country code for Indonesia is +62, and the leading trunk prefix 0 is omitted. The international dialing format becomes +62-357-XXXXXXX. For example, a local number such as 1234567 would be dialed as 0357-1234567 domestically and as +62 357 1234567 from abroad.

Caller Instructions and Overlay Considerations

Local callers within the Pacitan area can often dial the subscriber number directly without the area code, depending on the specific exchange and local call routing. However, for calls originating from outside the 357 area code but still within Indonesia, the full national format (including the trunk prefix 0) is mandatory. As of the current numbering plan, there is no overlay code for Pacitan, meaning the 357 code is exclusively used for this geographic region. Callers should be aware that fixed-line numbers in Indonesia are not portable across geographic areas; thus, the 357 prefix reliably indicates the caller is connected to a line physically located in the Pacitan regency.

Technical and Regulatory Notes

From a technical standpoint, the 357 code is part of the Indonesian National Numbering Plan, administered by the Ministry of Communication and Information Technology (Kominfo) and regulated by the ITU-T E.164 standard. The code is allocated to fixed-line operators, primarily PT Telkom Indonesia, which operates the PSTN infrastructure in the region. VoIP services may also use this code for geographic numbering, but the routing is still based on the physical location of the service address. For international callers, it is essential to replace the leading zero with the +62 country code to ensure proper routing through the international gateway. Understanding these dialing conventions ensures seamless connectivity to businesses and residents in Pacitan.