Area Code 23 – Mondorf-les-Bains/Bascharage/Noerdange/Remich

Geographic Coverage and Administrative Jurisdiction

The Luxembourgish national destination code +352 23 is a geographic area code allocated within the Grand Duchy of Luxembourg's national numbering plan, as administered by the Institut Luxembourgeois de Régulation (ILR). This code serves a cluster of localities in the southern and central-western parts of the country, specifically encompassing the towns of Mondorf-les-Bains, Bascharage, Noerdange, and Remich. These communities fall under the cantons of Remich and Capellen, with Mondorf-les-Bains and Remich located in the Moselle Valley near the borders with France and Germany, while Bascharage and Noerdange lie further west, closer to the Belgian frontier. The code is assigned to fixed-line PSTN and VoIP services within these areas, and subscribers are typically served by the national incumbent (POST Luxembourg) or alternative operators using local loop unbundling.

Dialing Formats and Caller Instructions

Luxembourg employs a closed dialing plan, meaning that the full national number (including the leading '23') must always be dialed, both for local and national calls. There are no separate trunk prefixes or area code truncation rules. For callers within Luxembourg, dial the eight-digit subscriber number directly, e.g., 23 45 67 89. For international callers, the country code +352 is prefixed, and the leading '0' is not used (Luxembourg does not use a trunk prefix). Thus, a call from abroad would be dialed as +352 23 45 67 89. When dialing from a mobile phone, the plus sign (+) may be replaced with the appropriate international access code (e.g., 00 from most European countries).

Numbering and Overlay Considerations

Geographic numbers in Luxembourg are eight digits in length, with the first two digits representing the geographic code. The '23' code is not overlaid with any other code; each geographic area retains its distinct prefix. However, number portability allows subscribers to retain their '23' numbers when switching operators, even if they move outside the geographic area, which can lead to non-geographic usage of these numbers. The ILR regulates the assignment of number blocks to ensure sufficient capacity for current and future demand.

Services and Usage

Numbers under +352 23 are primarily used for residential and business fixed-line services, including traditional PSTN and VoIP. They are also used for fax and alarm systems. As Luxembourg has a high penetration of mobile and VoIP services, the geographic code is often used by businesses to establish a local presence in the region. Callers should note that calls to +352 23 numbers are typically charged at standard national rates, depending on the caller's operator and subscription plan.