Area Code 051 – Bologna

Overview of Italy’s 051 Area Code

The 051 area code is a geographic or national destination code (NDC) within the Italian public switched telephone network (PSTN), assigned under the national numbering plan administered by the Autorità per le Garanzie nelle Comunicazioni (AGCOM). It serves the city of Bologna, the capital of the Emilia-Romagna region, and its surrounding metropolitan area. This includes the comuni of Casalecchio di Reno, Castel Maggiore, San Lazzaro di Savena, and numerous other localities within the former province of Bologna.

Geographic Coverage and Administrative Jurisdiction

The 051 NDC covers a territory that extends well beyond the city limits, encompassing the entire metropolitan city of Bologna. This area is one of Italy’s most economically vibrant regions, home to the oldest university in the Western world (the University of Bologna, founded in 1088) and a major transportation hub. The code is used for fixed-line telephone services, including traditional PSTN, ISDN, and VoIP services that are assigned a geographic number.

Dialing Formats and Usage

When calling a number in Bologna from within Italy, the national trunk prefix 0 is dialed before the area code, followed by the subscriber number. The complete national format is 0 51 XXX XXXX (or 051 XXXXXXX), where the subscriber number typically consists of 6 to 8 digits. For example, a local number might appear as 051 234 5678.

For international callers, the Italian country code +39 replaces the leading zero. Therefore, the international dialing format is +39 51 XXX XXXX (or +39 51 XXXXXXX). For instance, to call a Bologna number from abroad, you would dial +39 51 234 5678.

It is important to note that Italy does not use a trunk prefix for international calls; the leading zero is only used for domestic calls. Additionally, Italian fixed-line numbers are not portable across geographic areas, meaning a number with the 051 prefix is tied to the Bologna exchange area, even if the subscriber moves to a different part of the city.

Overlay and Numbering Considerations

Unlike some countries, Italy has not implemented overlay codes for geographic areas. The 051 code is the sole geographic NDC for the Bologna area. However, due to the increasing demand for numbers, the length of subscriber numbers has been expanded over the years. Currently, numbers can be 6 to 8 digits long, and all numbers within the 051 area are dialed with the full 10-digit national number (including the leading 0) even for local calls. This means that local calls within Bologna also require dialing the area code.

Caller Instructions

• Local callers (within Bologna): Dial the full national number: 051 XXX XXXX.
• Callers from other Italian cities: Dial the same national format: 051 XXX XXXX.
• International callers: Dial your country’s exit code, then 39 51 XXX XXXX (omit the leading zero).

For example, a caller from the United States would dial: 011 39 51 234 5678. A caller from the United Kingdom would dial: 00 39 51 234 5678.