Area Code 2132 – Oslo
The phone area code for Oslo is 2132 (international format +472132). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2132
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of +47 21 32
The prefix +47 21 32 is a geographic National Destination Code (NDC) assigned to the Oslo metropolitan area in Norway. Under the Norwegian Communications Authority (Nkom) numbering plan, numbers beginning with 21 are designated for fixed-line services within the capital region, covering the city of Oslo and its immediate administrative surroundings. This code is part of the larger 02x range, which historically served the Oslo area before the introduction of more granular prefixes.
Geographic Coverage and Administrative Jurisdiction
The 21 prefix is allocated to the Oslo region, which includes the central city districts (Sentrum, Frogner, St. Hanshaugen, Grünerløkka, Gamle Oslo) as well as adjacent boroughs like Nordstrand, Vestre Aker, and Østensjø. It also covers parts of the surrounding county of Viken that fall within the greater Oslo urban area. Businesses and residents within this zone may be assigned numbers starting with 21 32, followed by four additional digits, resulting in the full eight-digit subscriber number (e.g., 21 32 45 67).
Dialing Formats and Caller Instructions
National dialing (within Norway): Callers from other Norwegian regions must dial the full eight-digit number, including the leading 21, without any trunk prefix. For example, to reach a number in Oslo, dial 21 32 45 67.
International dialing (from abroad): Callers outside Norway should dial the international access prefix (00 or +), followed by the country code 47, and then the eight-digit subscriber number, omitting any leading zero. For instance, from the United States, you would dial 011 47 21 32 45 67 or +47 21 32 45 67.
Local dialing within Oslo: In most cases, even local calls within Oslo require the full eight-digit number, as Norway has adopted closed numbering. There is no separate local area code; the NDC is an integral part of the subscriber number.
Overlay and Numbering Considerations
Oslo has multiple geographic NDCs, including 21, 22, 23, 24, and 2x ranges, which serve as overlays for the same geographic area. This means that different numbers within the same region may start with different prefixes, but all are treated as local calls. There is no per-call charge differentiation based on the specific prefix; calls are priced according to the destination (fixed-line) and the caller's tariff plan.
Usage and Practical Information
Numbers under 21 32 are typically used by small to medium-sized enterprises, government offices, and residential subscribers. Because they are geographic, they are often associated with a physical presence in Oslo, which can be important for businesses that want to establish a local presence. When calling from a mobile phone, the same dialing rules apply, and the call is routed as a fixed-line call to the PSTN.
For international callers, it is essential to note that Norway uses the country code +47 and does not have separate mobile or trunk prefixes; all numbers are eight digits long. Therefore, the format +47 21 32 45 67 is unambiguous.