Area Code 2455 – Esch-sur-Alzette/Mondercange

Geographic Significance of +352 2455

The prefix +352 2455 is a geographic National Destination Code (NDC) assigned within the Luxembourgish public switched telephone network (PSTN). It serves the southern region of the Grand Duchy, specifically the communes of Esch-sur-Alzette and Mondercange, both located in the canton of Esch-sur-Alzette. This area is part of the country's industrial heartland, historically centered on steel production and now a hub for technology and logistics. The code is used for fixed-line services, including residential, business, and administrative lines, and is administered by the Institut Luxembourgeois de Régulation (ILR) in accordance with the national numbering plan.

Dialing Formats and Usage

For callers within Luxembourg, the national format requires dialing the full national significant number (NSN), which includes the NDC and the subscriber number. For the 2455 prefix, the complete number is typically 9 digits long (excluding the leading '0' that is used for domestic trunk prefix). For example, a local number might be 2455 12345. To call from abroad, you must use the international format: +352 2455 12345, omitting any leading '0'. The country code for Luxembourg is +352, and there is no trunk prefix in international dialing.

Geographic Coverage and Overlays

The 2455 prefix covers the urban area of Esch-sur-Alzette, the second-largest city in Luxembourg, and the neighboring commune of Mondercange. This region is well-connected by road and rail, and hosts several commercial zones and industrial parks. Unlike some countries, Luxembourg does not use overlay codes; each geographic area has a unique NDC. However, number portability allows subscribers to retain their numbers when moving to a different operator, but the geographic significance remains tied to the original assignment. For callers, this means that dialing a 2455 number always routes to a line physically located in the Esch-sur-Alzette/Mondercange area, unless the number has been ported to a VoIP service, which may alter routing but not the dialing format.

Practical Guidance for Callers

When calling a 2455 number from within Luxembourg, simply dial the 9-digit number (e.g., 2455 12345). From outside Luxembourg, dial your country's international access code (e.g., 00 from most European countries, 011 from the US), then 352, followed by the subscriber number without any leading zero. For example, a call from the United States would be: 011 352 2455 12345. It is important to note that Luxembourg has a closed numbering plan, so all numbers, including mobile and fixed, are 9 digits long. Always verify the number length when dialing to avoid errors.