Area Code 30 – Utrecht
The phone area code for Utrecht is 30 (international format +3130). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 30
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Utrecht
Overview of Area Code +31 30
Area code 30 is the geographic National Destination Code (NDC) assigned to the city of Utrecht and its surrounding municipalities within the Netherlands. Under the ITU-T E.164 international numbering plan, the full country calling code for the Netherlands is +31, so numbers in this region are dialed internationally as +31 30 XXX XXXX (or +3130XXXXXXX when written without spaces). Domestically, callers within the Netherlands must dial the trunk prefix 0 before the area code, resulting in the national format 030 – XXX XXXX.
Geographic Coverage and Jurisdiction
The 030 area code serves the province of Utrecht, including the city of Utrecht (the fourth-largest city in the Netherlands), as well as nearby towns such as Nieuwegein, IJsselstein, Houten, Zeist, Bunnik, and De Bilt. The administrative jurisdiction falls under the Province of Utrecht, and the code is managed by the Dutch regulatory authority (Autoriteit Consument & Markt, ACM) in accordance with the national numbering plan.
Numbering Format and Dialing Procedures
Subscriber numbers within the 030 area code are seven digits long (excluding the area code). The complete national number is 030 XXX XXXX (10 digits including the trunk prefix). For international callers, the format is +31 30 XXX XXXX (or +31 30 XXX XXXX without spaces).
- Local calls (within Utrecht): Dial the 7-digit subscriber number directly, e.g., 123 4567. The area code is not required.
- National calls (from other Dutch regions): Dial 030 followed by the 7-digit number, e.g., 030 123 4567.
- International calls (from abroad): Dial the international access prefix (e.g., 00 from most countries, or +), then 31, then 30, and the 7-digit number, e.g., +31 30 123 4567.
Overlay and Number Portability
As of the latest updates, there is no overlay code for the 030 area; the code remains exclusive to the Utrecht region. However, number portability is fully implemented in the Netherlands. This means that a geographic number starting with 030 may be used by a service provider outside the traditional region, though the number retains its geographic association for caller identification and routing purposes. Conversely, a subscriber in Utrecht may have a number with a different area code if they ported it from another location.
Practical Examples
To illustrate, a typical landline number in Utrecht might be +31 30 234 5678. A caller from the United States would dial 011 31 30 234 5678 (or +31 30 234 5678 from a mobile phone). A caller from Amsterdam (area code 020) would dial 030 234 5678. This code is used for fixed-line services, including PSTN and VoIP, and is not allocated to mobile networks.