Area Code 18 – Vienna
The phone area code for Vienna is 18 (international format +4318). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 18
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Vienna
Geographic Scope and Regulatory Framework
Prefix +43 18 is a geographic National Destination Code (NDC) assigned within the Austrian numbering plan, administered by the national regulatory authority, Rundfunk und Telekom Regulierungs-GmbH (RTR-GmbH). The code serves the federal capital, Vienna (Wien), and its surrounding administrative districts. As a geographic allocation, the prefix is tied to the PSTN infrastructure of the Vienna metropolitan area, although modern number portability may result in the physical termination of calls at alternative locations.
Dialing Formats and Usage
When calling a Vienna-based number from within Austria, subscribers must dial the national trunk prefix 0 followed by the NDC and the subscriber number. The complete national format is 0 18 XXX XXXX (where X denotes the local subscriber digits). For international callers, the country code +43 replaces the leading zero, resulting in the international format +43 18 XXX XXXX. It is essential to omit the leading zero when dialing from abroad.
For example, a typical Vienna landline number might be +43 18 234 5678. From within Austria, one would dial 018 234 5678. This format applies to both fixed and mobile calls, though mobile users may need to include the area code even for local calls, depending on their operator’s dialing plan.
Administrative and Geographic Coverage
The +43 18 prefix is used for numbers assigned to the city of Vienna, which is both a municipality and a federal state. The coverage area includes the 23 municipal districts (Bezirke) of Vienna, such as Innere Stadt (1st district), Leopoldstadt (2nd), Landstraße (3rd), and others. The prefix is not used for mobile services; mobile numbers in Austria are identified by prefixes beginning with +43 6 (e.g., 664, 676, 699).
Overlay and Numbering Considerations
Vienna has multiple geographic area codes, including 01 (the traditional city code) and 018 as an overlay or alternative code. This overlay allows for additional subscriber numbers without changing existing numbers. Callers within Vienna can dial local numbers without the area code in many cases, but for clarity and to avoid misdialing, it is recommended to always use the full national or international format.
Caller Instructions
- Local callers (within Vienna): Dial the subscriber number directly if the call is within the same local network, or use the full national format 018 XXX XXXX if required by your operator.
- National callers (outside Vienna): Dial 018 XXX XXXX.
- International callers: Dial +43 18 XXX XXXX.
Always verify the exact number of subscriber digits, as they may vary (typically 7 to 8 digits after the NDC). For any billing or routing inquiries, contact your service provider.