Area Code 2147 – Oslo
The phone area code for Oslo is 2147 (international format +472147). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2147
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Coverage and Administrative Jurisdiction
The area code 2147 is a geographic National Destination Code (NDC) assigned to the capital region of Norway, specifically the city of Oslo and its immediate surrounding areas. Oslo serves as the administrative and economic heart of Norway, hosting the national government, parliament (Storting), and the Royal Palace. The code falls within the broader Oslo numbering plan, which is characterized by eight-digit subscriber numbers when the leading '2' is included, following the country code +47.
Dialing Formats and Number Structure
In the international format, a number using this prefix is written as +47 21 47 XX XX (or +472147XXXXX, depending on the exact subscriber number length). The full national significant number (NSN) in Norway is eight digits, and the '21' portion is the initial digits of the NDC for Oslo. When dialing locally within Norway, callers must include the full eight-digit number, as there is no trunk prefix (such as '0') used in Norway. For example, a local call to a subscriber would be dialed as 21 47 XX XX, while an international caller would dial +47 21 47 XX XX.
Overlay and Numbering Considerations
Oslo and its surrounding areas are served by multiple geographic area codes, including 21, 22, 23, 24, and others. These codes are not overlays in the traditional sense; rather, they represent different numbering pools within the same geographic region. The 21 code is often used for newer allocations, including VoIP-based fixed-line services, which may not be tied to a physical address. However, the code remains geographic in nature, meaning that calls are routed based on the assigned exchange area.
Caller Instructions
- Local callers (within Norway): Dial the eight-digit subscriber number directly, e.g., 21 47 XX XX.
- International callers: Dial the international access prefix (00 or +), then Norway's country code 47, followed by the eight-digit number, e.g., 00 47 21 47 XX XX or +47 21 47 XX XX.
Since Norway uses a closed numbering plan, there is no need to drop any leading zero when dialing internationally. The country code +47 is used for all calls to Norway, and the NDC is always included in the number.
Practical Usage
Businesses and residents in Oslo with numbers starting with 2147 benefit from a recognizable geographic identity, which can be important for local trust and marketing. For international callers, it is essential to use the correct format to avoid misrouting. As with all Norwegian numbers, mobile and fixed-line numbers are not distinguished by a separate prefix; however, the 21 code is predominantly used for fixed-line and VoIP services.