Area Code 2366 – Oslo
The phone area code for Oslo is 2366 (international format +472366). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2366
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Coverage and Administrative Jurisdiction
The +47 2366 prefix is a geographic National Destination Code (NDC) assigned to the Oslo metropolitan area, the capital and largest city of Norway. This code falls within the 23xx range, which is dedicated to fixed-line services in the Oslo region. The administrative jurisdiction covers the municipality of Oslo and, in some cases, adjacent parts of the former Akershus county that have been integrated into the greater Oslo telephony area. Subscribers under this prefix are typically located within the city's central business district and surrounding residential neighborhoods.
Dialing Formats and Caller Instructions
For local callers within Norway, the number is dialed in the national format as 23 66 XX XX, where the leading '23' serves as the NDC and the remaining six digits form the subscriber number. No trunk prefix '0' is used in Norway, as the country uses a closed numbering plan with the country code +47. For international callers, the full E.164 format must be used: +47 23 66 XX XX. When dialing from abroad, replace the '+' with the appropriate international access code (e.g., 00 from most European countries, 011 from North America).
Overlay and Numbering Plan Considerations
Norway does not use area code overlays; instead, the entire country shares the single country code +47, and geographic NDCs are assigned to specific regions. The 23xx range is exclusively used for Oslo, and there is no overlay code for this area. This means that all fixed-line numbers in Oslo begin with 2, and the NDC is an integral part of the 8-digit subscriber number. Number portability is available, allowing subscribers to retain their numbers when changing operators, but the geographic significance of the prefix remains tied to the original location.
Services and Usage
Numbers under +47 2366 are primarily used for fixed-line PSTN and VoIP services. They are commonly associated with businesses and households in Oslo. As with all geographic numbers, they are subject to standard national call pricing, and calls to these numbers from mobile phones are typically charged at rates determined by the caller's mobile plan. For callers outside Norway, international rates apply. It is also important to note that some VoIP providers may allow users to register a +47 2366 number, but the service is still considered geographic and tied to the Oslo region.