Area Code 2657 – Esch-sur-Alzette/Schifflange

Geographic Coverage and Administrative Context

The prefix +352 2657 is a geographic National Destination Code (NDC) assigned within the Luxembourgish public switched telephone network (PSTN). It serves a specific cluster of localities in the southern part of the Grand Duchy, primarily the communes of Esch-sur-Alzette and Schifflange, both situated in the canton of Esch-sur-Alzette. This area forms part of the country's industrial heartland, historically tied to steel production and now a hub for commerce, education, and cross-border employment. The code is allocated to fixed-line services, including residential and business lines, and is administered by the Institut Luxembourgeois de Régulation (ILR), the national regulatory authority.

Dialing Formats and Number Structure

Luxembourg adheres to ITU-T E.164, with a complete international number comprising the country code +352 followed by a subscriber number. For the 2657 prefix, the full national significant number (NSN) is typically eight digits in length, including the prefix itself. Thus, a local number might appear as 2657 XXXX. When dialed from abroad, the format is +352 2657 XXXX. Within Luxembourg, callers can dial the eight-digit number directly without any trunk prefix, as the country uses a closed dialing plan. There is no separate area code; the NDC is an integral part of the subscriber number.

Caller Instructions

• Local callers (within Luxembourg): Dial the eight-digit number, e.g., 2657 1234. No additional prefixes are required.
• International callers (from outside Luxembourg): Dial the international access prefix (e.g., 00 from most countries, or + from mobile), followed by the country code 352 and the eight-digit subscriber number: +352 2657 1234.
• Callers from countries using the North American Numbering Plan (NANP): Dial 011 352 2657 1234.

Overlay and Numbering Considerations

Luxembourg does not employ overlay area codes; the entire country uses a single country code with variable-length NDCs. The 2657 prefix is one of several geographic NDCs allocated to the Esch-sur-Alzette region. As of the latest ILR numbering plan, no overlays are planned for this area, and number portability allows subscribers to retain their numbers when changing operators, though the geographic significance remains tied to the original allocation.