Area Code 45 – Onotoa

Overview of Onotoa (Area Code 45)

Area code 45 is a geographic National Destination Code (NDC) assigned to the island of Onotoa in the Republic of Kiribati. Onotoa is part of the Gilbert Islands group and is administratively located in the southern Gilbert Islands. The code is used for fixed-line telephone services (PSTN) within the island, which is served by the national telecommunications provider, Telecom Services Kiribati Limited (TSKL).

Geographic Coverage and Dialing Format

The 45 prefix covers the entire island of Onotoa, including its main villages and settlements. As a geographic code, it is tied to the physical location of the subscriber's line. The national significant number (NSN) for Onotoa numbers is 5 digits long, consisting of the area code (45) followed by a 3-digit subscriber number (e.g., 45XXX). The full international format for calling an Onotoa number is +686 45XXX.

When dialing from within Kiribati, callers must use the national trunk prefix 0 before the NSN. Thus, a local call to Onotoa from another part of Kiribati would be dialed as 0 45XXX. For example, to call a subscriber with the number 45123 from outside Kiribati, you would dial +686 45123. From within Kiribati (outside Onotoa), you would dial 045123.

Caller Instructions

• International callers: Dial the international access prefix (e.g., 00 or +) followed by the Kiribati country code 686, then the area code 45 and the subscriber number. Example: +686 45XXX.
• Local callers within Kiribati: Dial the trunk prefix 0, then the area code 45 and the subscriber number. Example: 045XXX.
• Callers within Onotoa: In many fixed-line networks, local calls within the same island may be made using only the subscriber number (XXX), but it is recommended to use the full national format for reliability.

Overlay and Numbering Considerations

As of the current numbering plan, there is no overlay code for Onotoa; the 45 code is exclusively assigned to this island. The Kiribati numbering plan follows the ITU-T E.164 recommendation, and the country code +686 is shared by all islands. Fixed-line numbers in Kiribati are not portable across different geographic areas, meaning that if a subscriber moves to another island, they must obtain a new number with the appropriate area code.

For businesses or individuals on Onotoa, it is important to ensure that international callers have the correct country code and area code to avoid misrouting. The Kiribati telecommunications infrastructure is gradually modernizing, but fixed-line services remain essential for government, education, and local commerce.