Area Code 4240 – Bad Kleinkirchheim

Geographic Overview

The Austrian area code +43 4240 is a geographic National Destination Code (NDC) assigned to the municipality of Bad Kleinkirchheim, located in the federal state of Carinthia (Kärnten) in the southern part of Austria. This code serves the Nockberge mountain region, a well-known alpine resort area. The service area includes the main town of Bad Kleinkirchheim and its surrounding districts, such as St. Oswald, Obertschern, and Untertschern. As a geographic code, it is used exclusively for fixed-line (PSTN) services, including traditional copper lines, ISDN, and VoIP-based fixed telephony.

Dialing Formats

When calling a number in Bad Kleinkirchheim from within Austria, you must use the national trunk prefix 0 followed by the area code and the subscriber number. For example, a local number might be dialed as:

• 0 4240 12345 (national format)

From outside Austria, you need to dial the international access code (typically 00 or +), followed by the Austrian country code 43, then the area code without the leading zero, and the subscriber number. For instance:

• +43 4240 12345 (international format)

Subscriber numbers in this area typically have a length of 5 to 7 digits, so the full national significant number (NSN) after the country code is usually between 9 and 11 digits.

Regulatory and Technical Notes

As with all geographic codes in Austria, the allocation is managed by the national regulatory authority, Rundfunk und Telekom Regulierungs-GmbH (RTR). The code is not portable to other geographic areas; it remains tied to the physical location of the line. However, number portability within the same geographic area is possible if the subscriber changes providers but keeps the same address. For VoIP services, users can often choose a number with this area code even if they are not physically located in the region, but the number remains associated with the Bad Kleinkirchheim tariff zone for billing and emergency services routing.

Caller Instructions

For local callers within the same area code, it is possible to dial only the subscriber number (without the area code) if the call is made from a fixed-line phone within the same exchange area. However, for clarity and to avoid issues with mobile or VoIP calls, it is recommended to always use the full national format. Mobile callers in Austria must always dial the full national number, including the leading 0. International callers should note that the leading 0 is omitted when using the +43 country code.