Area Code 1129 – Addis Ababa

Geographic Coverage and Administrative Jurisdiction

The Ethiopian country code +251 is followed by the National Destination Code (NDC) 1129 for landline telephone services in the capital city, Addis Ababa. This prefix is part of the 11xx series assigned to the Addis Ababa metropolitan area, which is both a chartered city and the seat of the federal government. The geographic area covered by the 1129 code encompasses the central business district and surrounding administrative zones, including key neighborhoods such as Arada, Kirkos, Yeka, and Bole. As a geographic number, the prefix is tied to the physical location of the subscriber's fixed-line connection, and it is managed by Ethio Telecom, the state-owned incumbent operator.

Dialing Formats and Caller Instructions

For local callers within Ethiopia, the number is dialed in the national format as 011 129 XXXX (or 011129XXXX), where the leading '0' is the trunk prefix used for domestic calls. The complete national significant number (NSN) is 9 digits, comprising the NDC (11) and the subscriber number (129XXXX). For international callers, the Ethiopian trunk prefix '0' is omitted, and the number is dialed as +251 11 129 XXXX (or +25111129XXXX). This format follows the ITU-T E.164 recommendation, ensuring global interoperability. For example, a typical landline number in this area might be +251 11 129 4567.

Overlay and Numbering Considerations

Addis Ababa has multiple NDCs (e.g., 111, 112, 113, 114, 116, 118, 119) to accommodate the high demand for fixed-line services. The 1129 prefix is a specific central office code within the 112 NDC. There is no overlay code; instead, different NDCs are assigned to different exchanges or service areas within the city. When dialing locally, callers must always include the NDC (11) even for calls within the same city, as per the national dialing plan. This is a departure from some countries where local calls can be made without the area code. For callers from outside Ethiopia, the plus sign (+) indicates the international access code, which varies by country (e.g., 00 in most European countries, 011 in the United States).

Technical and Regulatory Notes

Geographic numbers in Ethiopia are primarily used for PSTN (Public Switched Telephone Network) services, but they can also be routed to VoIP gateways for fixed wireless access. Number portability is not yet widely implemented for fixed lines, so the prefix generally indicates the subscriber's physical location. The Ethiopian Communications Authority (ECA) regulates numbering resources, and Ethio Telecom is the sole provider of fixed-line services. As the country modernizes its telecom infrastructure, these geographic numbers remain essential for businesses and government institutions that require a stable, location-based presence.