Area Code 2780 – Diekirch

Overview of Luxembourg's Geographic Numbering Plan

Luxembourg's national numbering plan, governed by the Institut Luxembourgeois de Régulation (ILR), follows the ITU-T E.164 standard. The country's country calling code is +352. Unlike many countries, Luxembourg does not use a trunk prefix (such as '0') for domestic calls. All national subscriber numbers are dialed as a fixed-length sequence of 9 digits, which includes the geographic area code and the subscriber number. The geographic area code for Diekirch is 2780, and it is part of the Northern region of the Grand Duchy.

Geographic Coverage and Administrative Jurisdiction

The 2780 prefix is assigned to the Diekirch area, which serves as the capital of the canton of Diekirch and is a significant administrative and commercial center in northern Luxembourg. The code covers the city of Diekirch itself and its immediate surroundings, including localities such as Bastendorf, Bettendorf, and Gilsdorf. These areas fall under the jurisdiction of the Diekirch commune within the Diekirch District. The region is known for its historical sites, including the National Museum of Military History, and its proximity to the Ardennes.

Dialing Formats and Caller Instructions

For local callers within Luxembourg, dialing a number in the Diekirch area requires only the 9-digit national significant number. For example, to reach a subscriber whose number is 2780 12345, a caller within Luxembourg would dial 2780 12345. No trunk prefix is needed. For international callers, the full international format must be used: +352 2780 12345. The leading '+' indicates the international access code, followed by the country code 352, then the area code (without any leading zero) and the subscriber number.

Numbering Structure and Overlay Considerations

Geographic numbers in Luxembourg are allocated in blocks of 10,000 numbers per area code. The 2780 prefix is one of several area codes serving the Diekirch region; other nearby codes include 2781 and 2782, which are also used for Diekirch and its environs. There is no overlay or area code splitting in Luxembourg; each geographic area has a unique prefix. However, due to number portability, a subscriber may retain their 2780 number even if they move to a different geographic area, but the number remains associated with the original location for routing purposes.

Regulatory and Technical Notes

All geographic numbers in Luxembourg are used for fixed-line PSTN and VoIP services. The ILR ensures that numbering resources are allocated efficiently and that consumers have the right to number portability. When calling from abroad, it is essential to use the international format to ensure proper routing. For example, a call from the United States to a Diekirch number would be dialed as 011 352 2780 12345. Always verify the subscriber number length, as all national numbers are exactly 9 digits.