Area Code 232 – Oslo
The phone area code for Oslo is 232 (international format +47232). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 232
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Coverage and Administrative Jurisdiction
The +47 232 prefix is a geographic National Destination Code (NDC) assigned to the central business district of Oslo, the capital of Norway. This code falls within the larger 23 range, which is dedicated to the Greater Oslo area, encompassing the city center and its immediate surroundings. Specifically, 232 serves a dense urban zone characterized by commercial, governmental, and residential addresses, including areas such as Sentrum, Aker Brygge, and parts of the historic Kvadraturen. The administrative jurisdiction aligns with the Oslo Municipality, which is both a county and a municipality in the Norwegian administrative structure.
Dialing Formats and Caller Instructions
For local callers within Norway, the number is dialed as an 8-digit subscriber number without any trunk prefix, as Norway uses a closed numbering plan. For example, a local call to a subscriber number 12345 would be dialed as 232 12345. For international callers, the full international format must be used: the international access prefix (e.g., 00 from most countries, or + from mobile phones), followed by the country code 47, the NDC 232, and the subscriber number. Thus, the same number would be dialed as +47 232 12345 from abroad. It is important to note that Norway does not use a trunk prefix (0) before the NDC, so international callers should not add an extra 0 after the country code.
Overlay and Numbering Considerations
The 232 prefix is part of an overlay complex within the Oslo numbering area. Multiple NDCs (e.g., 21, 22, 23, 24) serve the same geographic region, and there is no need for local area code changes when dialing within Oslo. Subscriber numbers under 232 are typically 5 digits long, resulting in a total national significant number length of 8 digits (NDC + subscriber number). This structure complies with ITU-T E.164 recommendations, which specify a maximum of 15 digits for international numbers, but Norway uses a shorter format for its geographic numbers.
For callers within Norway, dialing a number in the 232 area from another region does not require any additional codes; simply dial the 8-digit number. For example, a caller in Bergen would dial 232 12345 directly. This simplicity is a hallmark of Norway's numbering plan, which eliminated trunk prefixes to streamline dialing.
Practical Usage and Business Context
The 232 prefix is predominantly used by businesses and organizations operating in Oslo's central district. It is common for corporate headquarters, financial institutions, and government agencies to have numbers under this prefix. When contacting such entities from abroad, it is essential to use the +47 232 format to ensure proper routing through international telephony networks. Additionally, for VoIP users, the same dialing rules apply, but they must ensure their service provider supports international dialing to Norway.