Area Code 6251 – Donetsk

Geographic Overview

The +380 6251 prefix is a geographic National Destination Code (NDC) assigned to the Donetsk region of Ukraine, specifically serving the city of Kostiantynivka and its surrounding settlements. This area falls within the administrative boundaries of Donetsk Oblast, a key industrial hub in eastern Ukraine. The code is part of the national numbering plan administered by the Ukrainian State Centre of Radio Frequencies (UCRF) under ITU-T E.164 guidelines.

Dialing Formats

When calling a landline in Kostiantynivka, the number format is:

• National dialing (within Ukraine): 0 6251 XXX XX (where 0 is the trunk prefix, 6251 is the NDC, and the subscriber number typically consists of 5 to 7 digits).
• International dialing (from abroad): +380 6251 XXX XX (replace the leading 0 with +380).

For example, a local number might be 0 6251 2 34 56 when dialed from Kyiv, and +380 6251 2 34 56 when dialed from the United States or any other country.

Geographic Coverage and Jurisdiction

The 6251 area code serves the northern part of Donetsk Oblast, including the city of Kostiantynivka and nearby towns such as Druzhkivka (though some neighboring towns may use different codes). This is a geographic allocation, meaning the code is tied to a physical location and is used for fixed-line PSTN services. The region has historically been an important center for metallurgy and glass production.

Overlay and Numbering Considerations

As of the latest updates, there is no overlay code for 6251; the area is served solely by this NDC. However, due to the ongoing conflict in the Donetsk region, some fixed-line services may be disrupted or rerouted. Callers should be aware that network availability may vary. For VoIP or mobile calls, the geographic nature of the code does not apply—mobile numbers in Ukraine use separate prefixes (e.g., 50, 66, 95, etc.).

Caller Instructions

• Local callers within Kostiantynivka: You may need to dial the full national number (0 6251 ...) depending on your operator; some local calls may require only the subscriber number, but it is safer to use the full format.
• Callers from other Ukrainian cities: Dial 0 6251 followed by the subscriber number.
• International callers: Dial your country's exit code (e.g., 011 from the US, 00 from most European countries), then 380, then 6251, and the subscriber number. Do not include the leading 0.

Always confirm the current dialing procedures with your service provider, as routing may change due to network modernization.