Area Code 2367 – Oslo

Geographic Coverage and Administrative Jurisdiction

The area code 2367 is a geographic National Destination Code (NDC) within the Norwegian telephone numbering plan, allocated to the capital region of Oslo. As part of the Oslo numbering area, this code serves subscribers physically located within the city's administrative boundaries and its immediate surroundings. Oslo, being the economic and governmental hub of Norway, hosts a dense concentration of businesses, public institutions, and residential users, all of which may be assigned numbers under this NDC.

Dialing Formats and Caller Instructions

For local callers within Norway, the number is dialed in the national format: 23 67 XX XX. Note that the leading '0' trunk prefix is not used in Norwegian domestic dialing; the NDC is directly followed by the subscriber number. For international callers, the full E.164 format applies: +47 23 67 XX XX. The country code for Norway is +47, and the NDC '2367' is included without any additional trunk prefix. When calling from abroad, replace the '+' with the appropriate international access code (e.g., '00' from most European countries, '011' from North America).

Numbering Plan and Overlay Considerations

Norway employs a closed numbering plan, meaning that the national significant number (NSN) length is always 8 digits, regardless of whether the call is local or long-distance. The NDC '2367' is part of the larger Oslo numbering range, which includes multiple NDCs such as 21, 22, 23, 24, and others. There are no overlay codes in the traditional sense; instead, Oslo is served by a set of NDCs that are not area-specific but rather assigned to operators. However, geographic portability allows subscribers to retain their numbers when moving within the Oslo region, and even nationwide, subject to regulatory conditions.

Technical Infrastructure and Services

Numbers under the 2367 prefix are typically provisioned over the Public Switched Telephone Network (PSTN) and increasingly via Voice over IP (VoIP) platforms. They are used for fixed-line services, including analog, ISDN, and IP-based telephony. Businesses in Oslo often utilize these numbers for customer service lines, office communications, and fax services. The geographic nature of the code means that calls are routed based on the physical location of the exchange, although with modern network architecture, the actual routing may be IP-based, but the number retains its geographic significance for caller identification and regulatory purposes.

Practical Examples

• To call a number in Oslo from the United States: dial 011 47 23 67 XX XX.
• To call the same number from within Norway (e.g., from Bergen): dial 23 67 XX XX.
• To call from a mobile phone in Norway: simply dial 23 67 XX XX.

Understanding these dialing conventions ensures seamless connectivity with Oslo-based contacts, whether for business or personal purposes.