Area Code 2383 – Oslo
The phone area code for Oslo is 2383 (international format +472383). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2383
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2383
Area code 2383 is a geographic prefix within the Norwegian national numbering plan, allocated to the capital region of Oslo. As part of the +47 country code, this prefix is used for fixed-line (PSTN) services, and it follows the standard E.164 formatting rules for Norway. The code is assigned to a specific central office within Oslo, serving both residential and business subscribers.
Geographic Coverage and Administration
The 2383 prefix is administered by the Norwegian Communications Authority (Nkom) and is assigned to a local exchange in Oslo. Oslo, being the capital and largest city of Norway, is divided into several numbering areas, and 2383 is one of the many prefixes that serve the city's dense urban districts. The coverage area includes central Oslo neighborhoods and may extend to adjacent suburban zones, depending on the exact exchange location. Businesses and residents within this area typically have numbers formatted as +47 23 83 XX XX when dialed internationally.
Dialing Formats and Instructions
For callers within Norway, the national trunk prefix 0 is not used for geographic numbers; instead, the area code is dialed directly. Therefore, a local call to a 2383 number would be placed as 23 83 XX XX. International callers must dial the Norwegian country code +47 followed by the eight-digit subscriber number, omitting any leading zero. For example, a full international dialing sequence would be +47 23 83 XX XX. It is important to note that Norway does not use a trunk prefix like '0' for domestic calls, so the number is always dialed in its entirety.
Overlay and Number Portability
Oslo has implemented several overlay codes to accommodate the growing demand for telephone numbers. The 2383 prefix is part of the 23xx range, which is one of the many overlay codes used in the Oslo area. This means that subscribers may retain their 2383 numbers even if they move to a different physical location within the Oslo numbering area, thanks to number portability. However, the geographic association remains with the original exchange, and calls to 2383 numbers are always routed to the Oslo region.
Usage and Practical Considerations
Numbers with the 2383 prefix are primarily used for fixed-line services, including traditional PSTN and VoIP-based fixed lines. Many businesses in Oslo choose numbers with this prefix to establish a local presence. For callers, it is essential to verify the complete number, as the 23xx range is also used for some non-geographic services, but 2383 specifically is designated as geographic. When dialing from abroad, ensure you have the correct international access code (e.g., 00 from most European countries, or 011 from North America) before the +47 country code.