Area Code 77 – Novo Mesto/Krško

Overview of Slovenia's Geographic Area Code 77

Area code 77 is a geographic National Destination Code (NDC) within the Slovenian national numbering plan, administered under the ITU-T E.164 country calling code +386. This code serves the southeastern region of Slovenia, primarily encompassing the municipalities of Novo Mesto and Krško, along with their surrounding settlements. As a geographic allocation, numbers bearing this prefix are tied to a specific physical exchange area, and the tariff structure is based on the call's origin and destination.

Geographic Coverage and Administrative Jurisdiction

The 77 code covers the historical region of Dolenjska (Lower Carniola) and parts of the Posavje region. Key towns and cities within this area include Novo Mesto, the regional economic and cultural hub, Krško, known for its nuclear power plant, and other smaller municipalities such as Sevnica, Brežice, and Šentjernej. The area is served by fixed-line PSTN and VoIP operators, with numbers typically allocated to residential and business subscribers.

Dialing Formats and Caller Instructions

For callers within Slovenia, the national trunk prefix 0 is used before the area code. Thus, a local call to a subscriber in Novo Mesto would be dialed as 07 7XX XX XX (where the first 0 is the trunk prefix, 7 is the area code, and the remaining digits are the subscriber number). However, when dialing from abroad, the international access code (e.g., 00 from most European countries) is followed by Slovenia's country code 386, then the area code without the leading zero, and the subscriber number. For example, a call from the United States to a fixed line in Novo Mesto would be dialed as 011 386 7 7XX XX XX.

It is important to note that Slovenia's numbering plan is closed, meaning that all national numbers, including those with area code 77, have a fixed length of eight digits (excluding the trunk prefix). The subscriber number length within the 77 area is typically six digits, following the two-digit area code.

Overlay Considerations and Number Portability

Currently, there is no overlay code for the 77 area; the code is exclusively assigned to the Novo Mesto/Krško geographic region. However, as with all Slovenian geographic numbers, subscribers may retain their numbers when switching between fixed-line operators, thanks to local number portability regulations. This means that a number with the 77 prefix may not always be physically located in the original exchange area, but the geographic association remains for routing and tariff purposes.

Practical Guidance for Callers

For local callers within the same area code, it is common to dial only the subscriber number (without the area code) for local calls, though this practice varies by operator. For international callers, always ensure you use the correct exit code for your country, followed by 386 and the full national number (without the leading 0). For example, a call from the UK to a business in Krško would be dialed as 00 386 7 7XX XX XX. Always verify the complete number with the recipient, as misdialing can lead to unexpected charges or connection failures.