Area Code 2422 – Oslo
The phone area code for Oslo is 2422 (international format +472422). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2422
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Coverage and Administrative Jurisdiction
The Norwegian national destination code (NDC) 24 22 is a geographic prefix assigned to the Oslo metropolitan area, specifically within the central business district and adjacent administrative boroughs. As part of the Norwegian numbering plan under ITU-T E.164, this code routes calls to fixed-line PSTN and VoIP subscribers whose physical or registered address falls within the designated Oslo exchange area. The prefix is managed by the Norwegian Communications Authority (Nkom), which oversees the allocation of geographic numbers to ensure efficient routing and number capacity planning.
Dialing Formats and Caller Instructions
For domestic callers within Norway, the number must be dialed in the national format: 24 22 XX XX (8 digits total, including the leading '2' of the NDC). The trunk prefix '0' is not used in Norway; instead, callers simply dial the 8-digit subscriber number. For example, a local call to a subscriber would be dialed as 24 22 12 34.
International callers must dial the country code +47, followed by the NDC and subscriber number, omitting any leading zero. The full international format is +47 24 22 XX XX. For instance, a caller from abroad would dial +47 24 22 12 34 to reach the same subscriber. It is important to note that Norwegian geographic numbers are not portable to other geographic areas; they are tied to the Oslo exchange, but number portability allows subscribers to retain their number when changing operators within the same geographic area.
Overlay and Numbering Considerations
Oslo and its surrounding areas have multiple geographic NDCs, including 21, 22, 23, 24, and later 31, 32, etc., which are not overlays but distinct exchange codes. The 24 22 prefix is part of the 24 series, which was introduced to expand numbering capacity in the Oslo region. There is no overlay plan requiring 10-digit dialing; the national dialing plan uses 8-digit subscriber numbers for all geographic areas. Callers within Oslo do not need to add any extra digits when calling another Oslo number.
Practical Usage and Routing
Subscribers on the 24 22 prefix are typically connected via fiber-optic or copper PSTN lines, as well as VoIP services that register geographic numbers. Calls to these numbers are routed through the Norwegian public switched telephone network, and termination charges apply for calls originating from mobile networks or foreign countries. For businesses, having a geographic Oslo number can enhance local presence, and callers from abroad should be aware that international rates apply. Always verify the current numbering plan with Nkom or your telecom provider, as number allocations can change.