Area Code 2381 – Oslo
The phone area code for Oslo is 2381 (international format +472381). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2381
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2381
Area code 2381 is a geographic prefix within the Norwegian telephone numbering plan, specifically allocated to the capital city, Oslo. As part of the +47 country code, this prefix adheres to the ITU-T E.164 standard, ensuring seamless international dialing. The code is used for fixed-line services, connecting callers to businesses and residences in the central and surrounding districts of Oslo.
Geographic Coverage and Administration
The 2381 prefix falls under the administrative jurisdiction of the Norwegian Communications Authority (Nkom), which oversees the national numbering plan. Oslo, the primary city served, is divided into several boroughs, and this prefix may be assigned to specific exchanges or service areas within the city. While it is a geographic code, modern number portability allows subscribers to retain their number when moving within Norway, though the prefix still signifies its original Oslo allocation.
Dialing Formats and Instructions
For local callers within Norway, dialing the eight-digit subscriber number directly is sufficient, as the country code +47 is not required. For example, to reach a number with the prefix 2381, local callers would dial 23 81 XX XX. International callers must include the country code and drop the leading zero (if any), resulting in the format +47 23 81 XX XX. For instance, a typical number might be +47 23 81 45 67. It is important to note that Norwegian numbers do not use trunk prefixes like '0' when dialing internationally.
Overlay and Numbering Considerations
Oslo has implemented overlay codes to accommodate the growing demand for telephone numbers. This means that multiple area codes, including 2381, may serve the same geographic region. Consequently, local calls within Oslo may require ten-digit dialing (including the area code) even for nearby numbers, depending on the specific overlay plan. Subscribers and callers should verify the current dialing procedures to avoid connectivity issues.
Usage and Services
The 2381 prefix is predominantly used for fixed-line services, including PSTN and VoIP connections. Businesses in Oslo often utilize these numbers for customer service lines, while residential users rely on them for daily communication. As with all Norwegian numbers, calls to 2381 are subject to standard national and international tariffs, and the prefix does not indicate any premium or special service status.