Area Code 0423 – Treviso
The phone area code for Treviso is 0423 (international format +390423). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 0423
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Treviso
Geographic Overview
The Italian national destination code (NDC) 0423 is a geographic area code assigned to the province of Treviso, located in the Veneto region of northeastern Italy. The area code covers the city of Treviso and its surrounding municipalities, including but not limited to Villorba, Ponzano Veneto, Paese, and Quinto di Treviso. The numbering area is part of the Italian PSTN (Public Switched Telephone Network) and is administered by the Autorità per le Garanzie nelle Comunicazioni (AGCOM).
Dialing Formats
For domestic calls within Italy, the area code must be dialed with a leading zero. The full national significant number (NSN) for a fixed-line subscriber in the 0423 area is 10 digits long, including the leading zero. For example, a local number in Treviso might be dialed as 0423 123456 from anywhere in Italy. When calling from abroad, the international prefix (00 or +) is used, followed by the Italian country code 39, and then the area code without the leading zero. Thus, the same number would be dialed as +39 423 123456 from outside Italy.
Within the 0423 area, local calls may be dialed using only the subscriber number (without the area code) if the caller and callee are in the same local calling area, though this practice is becoming less common with the proliferation of mobile phones and VoIP services. However, for clarity and reliability, it is always recommended to dial the full national number, including the area code.
Geographic Coverage and Administration
The 0423 code is a geographic code, meaning that the number is tied to a physical location. The area is served by several telecom operators, including TIM, Vodafone, Wind Tre, and Fastweb, as well as numerous smaller ISPs and VoIP providers. The province of Treviso is known for its industrial and agricultural activities, with a strong presence of small and medium-sized enterprises. The city of Treviso is the administrative center of the province and is located approximately 30 kilometers north of Venice.
Numbering and Overlay Considerations
As of the latest AGCOM updates, there is no overlay code for the 0423 area. The numbering capacity is sufficient for the current demand, but as with all geographic codes, number portability allows subscribers to retain their numbers when switching operators, provided they remain within the same geographic area. This means that a number with the 0423 prefix is not necessarily assigned to a specific operator but is associated with the geographic location.
Caller Instructions
For callers within Italy, simply dial the full national number, including the leading zero. For callers from other countries, dial the international access code (00 from most countries, or + from mobile phones), followed by 39, and then the area code without the leading zero, followed by the subscriber number. For example, to call a Treviso number from the United States, you would dial 011 39 423 123456 or +39 423 123456 from a mobile phone.
It is important to note that while the 0423 code is primarily used for fixed-line services, some VoIP providers may assign numbers with this prefix to users who are not physically located in the area, but the number is still considered geographic for regulatory purposes.