Area Code 468 – Yokosuka, Kanagawa

Overview of Area Code 468

Area code 468 is a geographic numbering plan area within the Japanese telephone numbering system, specifically assigned to the city of Yokosuka and its surrounding areas in Kanagawa Prefecture. This code is part of the national numbering plan administered by the Ministry of Internal Affairs and Communications (MIC) and follows the ITU-T E.164 international standard. When dialing from abroad, the full international format is +81 468 XXX XXX, where the leading zero of the domestic trunk prefix is omitted.

Geographic Coverage and Administrative Jurisdiction

The 468 area code covers Yokosuka, a major port city located on the Miura Peninsula in Kanagawa Prefecture. It also includes neighboring municipalities such as Miura, Hayama, and parts of Zushi. Yokosuka is known for its strategic naval bases and is part of the Greater Tokyo Area, though it retains a distinct local identity. The area code is administered by NTT East, the regional telecommunications carrier for eastern Japan. The numbering area is classified as geographic, meaning that the code is tied to a specific physical location and is used for fixed-line services, including PSTN and IP-based fixed telephony.

Dialing Formats and Instructions

For local callers within the same numbering area, the area code is typically omitted, and calls are placed using the local subscriber number, which is seven digits long. For example, to call a number in Yokosuka from within the 468 area, one would dial just the seven-digit number. However, when calling from outside the area code but still within Japan, callers must dial the trunk prefix 0 followed by the area code and the subscriber number: 0-468-XXX-XXX. For instance, a call from Tokyo to Yokosuka would be dialed as 0468-XXX-XXX. International callers should dial +81 468 XXX XXX, dropping the leading zero. It is important to note that the subscriber number length is seven digits, so the complete domestic number is 10 digits including the area code.

Overlay and Numbering Considerations

Currently, there is no overlay plan for area code 468, meaning that the code is not shared with another area code in the same region. However, as part of Japan's ongoing telecommunications reforms, number portability is available for fixed-line services, allowing users to retain their numbers when switching carriers. This does not affect the geographic significance of the code. For VoIP services, users may be assigned numbers from this area code even if they are not physically located in Yokosuka, but such assignments are subject to regulatory guidelines to ensure that geographic codes remain associated with their designated regions.

Practical Calling Examples

To illustrate, if you are in the United States and wish to call a business in Yokosuka with the local number 123-4567, you would dial 011 81 468 123 4567. If you are in Osaka, Japan, you would dial 0468-123-4567. For local calls within Yokosuka, simply dial 123-4567. These examples demonstrate the importance of using the correct international and domestic prefixes to ensure successful connection.