Area Code 2151 – Krefeld
The phone area code for Krefeld is 2151 (international format +492151). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2151
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Krefeld
Geographic Overview
The area code +49 2151 is the national destination code (NDC) assigned to the city of Krefeld, located in the western part of North Rhine-Westphalia, Germany. Krefeld is situated on the left bank of the Lower Rhine, approximately midway between Düsseldorf (about 20 km to the east) and Duisburg (about 15 km to the north). The code covers the entire urban area of Krefeld, including its districts such as Hüls, Oppum, Linn, Uerdingen, and Fischeln. As a geographic number, the prefix is tied to the fixed-line PSTN network, and numbers are allocated by the German Federal Network Agency (Bundesnetzagentur).
Dialing Formats
For callers within Germany, the number is dialed as 02151 followed by the subscriber number, which typically has a length of 6 to 7 digits, resulting in a total national significant number (NSN) length of 10 to 11 digits. For international callers, the format is +49 2151 followed by the subscriber number, omitting the leading zero. For example, a local number such as 1234567 would be dialed as 02151 1234567 from within Germany, and as +49 2151 1234567 from abroad.
Overlays and Numbering
Krefeld does not have an overlay code; the area code 02151 is exclusively used for the city. However, adjacent areas use different codes, such as 02152 for Meerbusch, 02153 for Willich, and 02154 for Kempen. Subscriber numbers in Krefeld are assigned by Deutsche Telekom and other fixed-line carriers, and since the liberalization of the German telecom market, customers can retain their numbers when switching providers (number portability).
Caller Instructions
For local callers within the Krefeld area, it is possible to dial only the subscriber number for local calls, but this practice is becoming less common as it depends on the network configuration. To avoid confusion, it is recommended to always use the full national format with the area code. For callers from other German regions, dial 02151 followed by the subscriber number. For international callers, replace the leading zero with the German country code +49, and drop the zero: +49 2151.
When calling from a mobile phone, the same rules apply: use the full international format or national format as appropriate. It is important to note that calls to geographic numbers are subject to standard fixed-line tariffs, which may vary depending on the caller's provider and any flat-rate plans.