Area Code 11 – Ulaanbaatar

Overview of Mongolia's +976 11 Geographic Code

The country calling code +976 is assigned to Mongolia under the ITU-T E.164 international numbering plan. Within the Mongolian national numbering plan, the prefix 11 serves as the National Destination Code (NDC) for the capital city, Ulaanbaatar. This is a geographic allocation, meaning the code is tied to a specific administrative region rather than a service type. Ulaanbaatar is not only the political and economic center of Mongolia but also the most densely populated area, containing nearly half of the country's population.

Geographic Coverage and Administrative Jurisdiction

The +976 11 code covers the entire Ulaanbaatar municipality, including its central districts (such as Chingeltei, Sukhbaatar, and Bayanzurkh) and the surrounding suburban areas that fall within the city's administrative boundaries. Unlike some countries where a single city may have multiple area codes, Ulaanbaatar uses a unified geographic code for all fixed-line services within its jurisdiction. This simplifies dialing for both local residents and international callers.

Dialing Formats and Number Structure

Mongolian fixed-line numbers in Ulaanbaatar follow a standard format: the NDC (11) is followed by a 7-digit subscriber number, resulting in a total national significant number (NSN) length of 9 digits. The complete international format is +976 11 XXX XXXX. For example, a typical Ulaanbaatar landline number would be dialed as +976 11 234 5678 from abroad. When calling domestically from another region in Mongolia, callers must include the trunk prefix 0 before the NDC, resulting in 011 XXX XXXX. However, local calls within Ulaanbaatar can be made using only the 7-digit subscriber number, omitting the area code entirely.

Caller Instructions

• International callers: Dial the international access prefix (e.g., 00 from most countries, or + on mobile), followed by 976, then 11, and finally the 7-digit local number. Example: +976 11 234 5678.
• Domestic callers outside Ulaanbaatar: Dial 0 (trunk prefix), then 11, then the 7-digit subscriber number. Example: 011 234 5678.
• Local callers within Ulaanbaatar: Simply dial the 7-digit subscriber number. Example: 234 5678.

Overlay and Numbering Considerations

Currently, there is no overlay code for Ulaanbaatar; the 11 code remains exclusive to the capital's fixed-line network. However, due to the rapid growth of VoIP and mobile services, some businesses may use non-geographic numbers that are not tied to a specific region. It is important to verify that a number starting with 11 is indeed a fixed-line service, as mobile numbers in Mongolia begin with different prefixes (e.g., 8, 9, 5) and are non-geographic. Number portability is available in Mongolia, allowing subscribers to retain their numbers when changing operators, but the geographic significance of the 11 code remains unchanged for fixed lines.