Area Code 43 – Ancash

Geographic Overview

The country calling code +51 is assigned to Peru under the ITU-T E.164 international numbering plan. Within this national plan, the area code 43 is a geographic National Destination Code (NDC) allocated to the Ancash region, located in north-central Peru. Ancash is administratively divided into 20 provinces, with its capital and largest city being Huaraz, a major gateway to the Cordillera Blanca and Huascarán National Park. Other significant cities served under this code include Chimbote, a principal seaport and industrial center, and Casma, known for its archaeological sites such as Sechín. The code covers both coastal and highland areas, including the Callejón de Huaylas valley.

Dialing Formats

When calling a fixed-line subscriber in Ancash from within Peru, the national trunk prefix '0' is used followed by the area code and the subscriber number. The local subscriber number in Ancash typically consists of six digits for Huaraz and other major cities, while some smaller localities may have five-digit numbers. The complete national format is: 0 43 XXX XXX (or 0 43 XXXXX for shorter numbers). For international callers, the format is: +51 43 XXX XXX (or +51 43 XXXXX). For example, a landline in Huaraz might be dialed as +51 43 123456 from abroad, or 043 123456 from within Peru. It is essential to drop the leading '0' when dialing from outside Peru.

Caller Instructions

Local callers within the same area code can often dial the subscriber number directly without the area code, depending on the specific local dialing plan. However, to avoid confusion, it is recommended to always include the area code when dialing from a mobile phone or from a different region. For international callers, the plus sign (+) represents the international access code, which varies by country (e.g., 011 from the US/Canada, 00 from many European countries). After dialing the international prefix, enter 51, then 43, and finally the subscriber number.

Regulatory and Technical Notes

Peru's numbering plan is administered by the Ministry of Transport and Communications (MTC) and the telecom regulator OSIPTEL. Geographic area codes are assigned based on departmental boundaries, and Ancash's code 43 is part of the fixed telephony network. As of recent years, Peru has implemented number portability for fixed lines, allowing subscribers to retain their numbers when changing operators within the same geographic area. Overlay codes have been introduced in some regions to expand capacity, but as of now, Ancash primarily uses the 43 code without an overlay. Calls to this code from mobile networks are charged as local or national long-distance depending on the caller's location and plan.