Area Code 645 – Lhokseumawe

Overview of Area Code 645 (Lhokseumawe, Indonesia)

Area code 645 is a geographic National Destination Code (NDC) assigned to the city of Lhokseumawe and its surrounding areas in the province of Aceh, Indonesia. This code is part of the Indonesian national numbering plan, which follows ITU-T E.164 recommendations. Geographic area codes in Indonesia are used for fixed-line (PSTN) services, and they identify a specific administrative region for routing calls within the national network.

Coverage and Administrative Jurisdiction

The 645 area code covers the municipality of Lhokseumawe (Kota Lhokseumawe) and adjacent districts within North Aceh Regency (Kabupaten Aceh Utara), including towns such as Banda Sakti, Muara Dua, and Dewantara. The region is a major industrial hub, home to the Arun LNG facility and various petrochemical plants, which influences the demand for reliable telecommunication services.

Dialing Formats

For local calls within the same area code, callers typically dial only the subscriber number, which consists of 5 to 7 digits. However, the exact length may vary depending on the service provider and historical number allocations. For calls from outside the Lhokseumawe area but still within Indonesia, the full national format is used: 0 645 XXXX XXX (where X represents the subscriber number). For international callers, the country code for Indonesia (+62) replaces the leading trunk prefix '0', resulting in the format: +62 645 XXXX XXX. For example, a local number might be dialed as 0645 12345 nationally and +62 645 12345 internationally.

Overlay and Numbering Considerations

As of the latest ITU-T and national regulatory updates, there are no overlay codes for the 645 area. The numbering plan is administered by the Indonesian Telecommunication Regulatory Authority (BRTI) under the Ministry of Communication and Informatics. Subscriber numbers are allocated to fixed-line operators, including Telkom Indonesia and other licensed PSTN providers. Number portability for fixed lines is available, allowing users to retain their numbers when switching operators, but the geographic significance of the code remains unchanged.

Caller Instructions

• Local callers (within the 645 area): Dial the subscriber number directly without the area code.
• National callers (outside the 645 area): Dial 0645 followed by the subscriber number.
• International callers: Dial the international access prefix (e.g., 00 or +) then 62 645 and the subscriber number.

When calling from a mobile phone, it is common to use the international format even for domestic calls, as mobile networks handle both formats seamlessly. However, using the national format with the leading '0' is also acceptable.

For businesses or individuals in Lhokseumawe, it is essential to display numbers in international format on websites and marketing materials to facilitate global communication. The area code is a key part of the region's identity and is crucial for accurate call routing.