Area Code 45 – Diedrich

Geographic Coverage and Administrative Jurisdiction

The +352 45 prefix is a geographic National Destination Code (NDC) assigned to the Diedrich region in Luxembourg. This area encompasses the central-western part of the Grand Duchy, including the town of Diedrich and its surrounding communes. The code serves both residential and business subscribers within this administrative jurisdiction, which falls under the canton of Capellen. The region is characterized by a mix of rural communities and small commercial centers, with Diedrich acting as the primary hub.

Dialing Formats and Number Structure

In Luxembourg, the national numbering plan follows the ITU-T E.164 standard, but with a unique feature: all subscriber numbers, including geographic ones, have a fixed length of 9 digits when dialed domestically, excluding the trunk prefix '0'. For the +352 45 prefix, the local number typically consists of 4 to 5 additional digits, resulting in a total of 6 to 7 digits for the complete national significant number (NSN). For example, a local number might be 45 12 34 (6 digits) or 45 123 45 (7 digits).

When dialing within Luxembourg, you simply dial the NDC followed by the subscriber number, without any trunk prefix. For instance, to call a number in Diedrich from another part of Luxembourg, you would dial 45 12 34. However, when calling from abroad, you must use the international format: +352 45 12 34 (or +352 45 123 45). The leading '0' is not used in international dialing.

Caller Instructions

For local callers within Luxembourg: Simply dial the 6 or 7-digit number as listed, starting with '45'. There is no need to add an area code or trunk prefix. For international callers: Dial the international access code (e.g., '00' from most European countries, or '+' from mobile phones), followed by Luxembourg's country code 352, then the NDC 45 and the subscriber number. Do not include any leading zeros.

Overlay and Numbering Plan Considerations

Luxembourg does not use overlay codes for geographic areas; each NDC is unique to a specific region. The +352 45 prefix is exclusively assigned to the Diedrich area, and there are no plans for an overlay as the numbering resources are sufficient. However, number portability allows subscribers to retain their numbers when moving to a different geographic area, which means that a number with the 45 prefix might occasionally be served by an exchange outside the Diedrich region. This is a rare occurrence and does not affect the dialing format.

For businesses, it is important to note that geographic numbers are often used for local presence, and callers may expect to reach a physical location. However, with VoIP and IP-based services, geographic numbers can be redirected to anywhere in the world, but the caller is still charged as a local call to Luxembourg.