Area Code 51 – Rogaland
The phone area code for Rogaland is 51 (international format +4751). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 51
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Rogaland
Geographic Coverage and Administrative Jurisdiction
The Norwegian country calling code +47 is complemented by the geographic area code 51, which designates the southwestern county of Rogaland. This National Destination Code (NDC) serves as the primary fixed-line routing identifier for the region's PSTN (Public Switched Telephone Network) subscribers. Rogaland's administrative center, Stavanger, along with neighboring municipalities such as Sandnes, Sola, Randaberg, and Klepp, fall within the 51 numbering area. The code is allocated by the Norwegian Communications Authority (Nkom) and follows the ITU-T E.164 international numbering plan.
Dialing Formats and Caller Instructions
For domestic callers within Norway, the area code is dialed with a leading zero: 051 followed by the subscriber number, which typically consists of five to six digits. The complete national significant number (NSN) length is eight digits, including the area code. International callers must replace the leading zero with the country code, resulting in the format +47 51 xx xx xx. For example, a fixed line in Stavanger might be reached at +47 51 23 45 67. When dialing from abroad, ensure you omit the initial '0' of the area code.
Overlay and Numbering Considerations
Currently, the 51 area code does not have an overlay code; it remains the sole geographic code for Rogaland's fixed-line services. However, due to the increasing demand for telecommunication services, Nkom has implemented number portability, allowing subscribers to retain their numbers when switching operators. This means that a number beginning with 51 may be served by any licensed fixed-line operator, not necessarily the incumbent Telenor. Additionally, the geographic nature of the code implies that calls are routed based on the physical location of the exchange, but with VoIP services, the actual location may be decoupled from the number's geographic assignment.
Practical Guidance for Callers
For local callers within the 51 area, it is common to dial only the subscriber number (without the area code) for calls within the same exchange, though this practice is becoming less standardized with the advent of unified dialing plans. To ensure connectivity, it is recommended to always use the full national format (051 xx xx xx) for domestic calls and the international format (+47 51 xx xx xx) for calls from abroad. Businesses in Rogaland often list their numbers in international format to facilitate global communication. When calling from a mobile phone, the same dialing rules apply, as mobile networks in Norway use the same country code +47 without a separate mobile prefix.