Area Code 52 – Ulsan

Overview of Area Code 52

Area code 52 is a geographic National Destination Code (NDC) assigned to Ulsan, a major industrial metropolis located on the southeastern coast of South Korea. Ulsan is a Metropolitan City with administrative status equivalent to a province, and its numbering plan falls under the +82 52 country code and area code combination. This code is used for fixed-line PSTN (Public Switched Telephone Network) services within the city, including residential, business, and government lines. Ulsan is known for its heavy industry, including the world's largest automobile assembly plant and shipbuilding facilities, which means many corporate offices and industrial complexes rely on this area code for their landline communications.

Geographic Coverage and Administrative Jurisdiction

The 52 area code covers the entire administrative boundaries of Ulsan Metropolitan City, which includes the four districts (gu) of Buk-gu, Dong-gu, Jung-gu, and Nam-gu, as well as the three counties (gun) of Ulju-gun. Key commercial and residential areas such as Samsan-dong, the central business district, and the industrial zones of Onsan and Mipo are all served by this code. The code is exclusively used for fixed-line services; mobile numbers in South Korea use separate non-geographic prefixes (e.g., 010) and are not tied to this area code.

Dialing Formats and Instructions

For callers within South Korea, dialing a Ulsan landline requires the trunk prefix '0' followed by the area code '52' and the local subscriber number. The local numbers are typically 8 digits long, so the full domestic format is 0XX-XXXX-XXXX, where '0' is the trunk prefix, '52' is the area code, and the remaining 8 digits are the subscriber number. For example, a typical Ulsan number might be 052-123-4567.

For international callers, the format is +82 52 XXXX XXXX (or +82-52-XXXX-XXXX). The leading '0' of the domestic trunk prefix is omitted when dialing from abroad. For instance, to call a Ulsan number from the United States, you would dial 011 82 52 XXXX XXXX (or use the '+' sign on mobile phones). It is important to note that the subscriber number length may vary, but the total number of digits after the country code and area code is always 8.

Overlay and Numbering Plan Considerations

Ulsan does not currently have an overlay area code; the 52 code is the sole geographic code for the city. However, as with many metropolitan areas, number exhaustion is managed by the Korea Communications Commission (KCC) and the Korea Internet & Security Agency (KISA). In the future, if additional numbering resources are required, an overlay code could be introduced, but as of now, all fixed-line numbers in Ulsan begin with the digits '052' when dialed domestically.

For callers outside South Korea, it is essential to remember that the international access code varies by country (e.g., 011 in the US, 00 in most European countries). Additionally, when storing Ulsan numbers in international format, always use the plus sign (+) followed by the country code 82 and the area code without the leading zero, such as +82 52 XXXX XXXX.