Area Code 71 – Leiden
The phone area code for Leiden is 71 (international format +3171). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 71
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Leiden
Geographic Overview
The +31 71 country and area code combination is the international dialing prefix for the Leiden numbering plan area in the Netherlands. This geographic code serves the city of Leiden, the Oude Rijn zone, and surrounding municipalities within the province of South Holland. Key localities covered include Leiden, Leiderdorp, Oegstgeest, Voorschoten, and Zoeterwoude, as well as smaller communities such as Katwijk aan Zee and Rijnsburg. As a geographic number, the prefix is tied to a fixed-line infrastructure, historically provisioned over the PSTN, though many subscribers now use VoIP-based telephony while retaining the same number.
Dialing Formats and Usage
Within the Netherlands, callers must dial the trunk prefix 0 followed by the area code and subscriber number: 071-XXXXXXX (where X denotes the seven-digit local number). Internationally, callers replace the leading 0 with the country code +31, resulting in +31 71 XXXXXXX. For example, a local number such as 071 123 4567 becomes +31 71 1234567 when dialed from abroad. The seven-digit subscriber numbers are allocated to fixed-line services, including residential, business, and government lines. No overlay code exists for this area; the 071 code remains exclusive to the Leiden region.
Caller Instructions
- Local callers within the 071 area can dial the seven-digit subscriber number directly without the area code, provided they are calling from a line within the same geographic region.
- National callers outside the 071 area must dial 071 followed by the subscriber number (e.g., 071 1234567).
- International callers must dial the international access prefix (00 or +) followed by 31, then 71, and the subscriber number (e.g., +31 71 1234567).
Regulatory and Technical Notes
Numbering in the Netherlands is regulated by the Authority for Consumers and Markets (ACM). The 071 prefix is classified as a geographic number, and its use is not restricted to any specific operator; subscribers may retain their numbers when switching providers (number portability). While originally designed for fixed-line services, the code can also be used by VoIP providers, but it does not support mobile services, which use non-geographic prefixes such as 06. For businesses, having a 071 number establishes a local presence in the Leiden area, which can be beneficial for customer trust and local marketing.