Area Code 81 – Madrid

Overview of Area Code +34 81

Area code 81 is a geographic National Destination Code (NDC) assigned to the capital region of Spain, specifically the province and autonomous community of Madrid. This code is part of the national numbering plan under the country code +34, as defined by the International Telecommunication Union (ITU-T E.164). The 81 prefix is used for fixed-line telephone services within the Madrid metropolitan area and its surrounding municipalities.

Geographic Coverage and Jurisdiction

The +34 81 code covers the entire administrative region of Madrid, which includes the capital city of Madrid and its extensive metropolitan area. This encompasses major districts such as Centro, Salamanca, Chamberí, and outlying cities like Alcalá de Henares, Móstoles, and Getafe. The code is assigned by the Spanish telecommunications regulator (Comisión Nacional de los Mercados y la Competencia, CNMC) to fixed-line operators providing PSTN and VoIP services within this demarcated geographic zone.

Dialing Formats and Procedures

For both local and international callers, the dialing format for numbers under the 81 code is straightforward. Since Spain uses a closed numbering plan, all national numbers are nine digits long, including the leading NDC. There is no trunk prefix like '0' in other countries; callers within Spain must dial the full nine-digit number, starting with the area code. For example, a local call to a Madrid fixed line would be dialed as 81 XXX XX XX (where X represents the subscriber number). International callers must dial the Spanish country code +34, followed by the area code and subscriber number, omitting any leading zero (which does not exist in this plan). Thus, the international format is +34 81 XXX XX XX.

Overlay and Numbering Considerations

Madrid is served by multiple geographic area codes, including 91, 81, and others. The 81 code was introduced as an overlay to provide additional numbering capacity for the region. This means that within the same geographic area, different numbers may have different area codes, but all are treated as local calls. There is no need to dial a different prefix for calls between 91 and 81 numbers; they are all part of the same local calling area. This overlay system allows for more efficient use of numbering resources and supports the growing demand for fixed-line services, including VoIP and fiber-optic connections.

Caller Instructions

For callers within Spain, simply dial the nine-digit number (e.g., 81 234 56 78). For international callers, dial +34 81 234 56 78. It is important to note that Spanish numbers do not have a '0' prefix, so do not add one after the country code. This applies to both landline and mobile calls. If you are calling from a mobile phone, the same rules apply. For any issues with call routing, contact your service provider.