Area Code 566 – Grou
The phone area code for Grou is 566 (international format +31566). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 566
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Grou
Geographic Coverage and Administrative Jurisdiction
The +31 566 area code is a geographic National Destination Code (NDC) assigned to the town of Grou (also spelled Grouw) and its immediate surroundings in the province of Friesland, in the northern Netherlands. Grou is located in the municipality of Leeuwarden, situated on the picturesque Pikmeer lake, and is known for its water sports and historic village center. The code covers the local exchange area that includes the village itself and the adjacent rural hamlets, but it does not extend to the larger city of Leeuwarden, which uses the separate area code 058.
Dialing Formats and Caller Instructions
For callers within the Netherlands, the national trunk prefix 0 must be dialed before the area code, followed by the subscriber number. The complete national format is:
- 0566 + local subscriber number (typically 6 or 7 digits)
For example, a local number in Grou might be dialed as 0566 123456 from anywhere in the country.
For international callers, the country code for the Netherlands is +31, and the leading zero of the area code is dropped. Thus, the international format becomes:
- +31 566 + local subscriber number
So the same number would be dialed as +31 566 123456 from abroad. When calling from a mobile phone within the Netherlands, it is also acceptable to use the international format with the +31 prefix, as this ensures proper routing regardless of the caller's location.
Numbering Plan and Overlay Considerations
As of the latest ITU-T E.164 national numbering plan for the Netherlands, the 0566 area code is a closed numbering plan segment, meaning that the subscriber number length is fixed within the area. There are no overlay codes or additional NDCs assigned to Grou; the code is exclusive to this geographic region. The Dutch regulatory authority (Autoriteit Consument & Markt – ACM) manages the allocation of geographic numbers, and as of 2025, no changes have been announced that would affect the dialing procedures for this area.
Services and Usage
Geographic numbers in the Netherlands, including those under 0566, are traditionally used for fixed-line PSTN and VoIP services. However, due to number portability, a number with the 0566 prefix may be routed to a VoIP service or even a mobile network, but the geographic association remains for billing and emergency services purposes. When calling emergency services (112) from a 0566 number, the call is automatically routed to the appropriate regional dispatch center based on the registered address of the line.
For businesses and residents in Grou, having a local geographic number enhances local presence and trust. For callers, it is important to note that calls to 0566 numbers from within the Netherlands are typically included in national calling plans, while international callers will incur international rates as per their carrier's tariff.