Area Code 425 – Castleblaney
The phone area code for Castleblaney is 425 (international format +353425). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 425
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Castleblaney
Geographic Overview
The +353 425 area code is a geographic National Destination Code (NDC) assigned to the town of Castleblaney (also spelled Castleblayney) and its surrounding areas in County Monaghan, Republic of Ireland. This code falls within the ITU-T E.164 numbering plan for Ireland, specifically designated for fixed-line PSTN and VoIP services. Castleblaney is located in the northern part of the Republic, near the border with Northern Ireland, and is part of the Border Region. The area code covers the town itself, as well as nearby rural communities and townlands within the catchment area.
Dialing Formats
When calling a landline in Castleblaney from within Ireland, subscribers must dial the national trunk prefix 0, followed by the area code 425, and then the local subscriber number. The full national format is (0425) xxx xxx, where the local number typically consists of six digits. For example, a local number might be dialed as 0425 123456 from within Ireland.
For international callers, the country code for Ireland is +353, and the leading 0 of the national prefix is omitted. Thus, the international dialing format becomes +353 425 xxx xxx. For instance, to call a Castleblaney number from abroad, you would dial +353 425 123456.
Caller Instructions
- Local callers (within Ireland): Dial 0425 followed by the six-digit local number. If calling from a mobile phone, the same format applies, and the call is charged at standard national rates.
- International callers: Dial your country's international access code (e.g., 00 from most European countries, 011 from North America), then 353, then 425, and the six-digit local number. Do not include the leading 0.
Administrative and Jurisdictional Context
Castleblaney is the second-largest town in County Monaghan and serves as a commercial and administrative hub for the surrounding area. The code is administered by ComReg, Ireland's telecommunications regulator, and is allocated to fixed-line operators such as Eir, Virgin Media, and various VoIP providers. As with all Irish geographic codes, the area code is not portable to mobile numbers, but fixed-line number portability allows subscribers to retain their number when switching between fixed-line operators within the same geographic area.
Overlay and Numbering Considerations
Currently, there is no overlay code for the 425 area, meaning the code is exclusively used for Castleblaney and its environs. However, due to the increasing demand for numbers, ComReg has implemented a strategy to ensure sufficient numbering capacity. Subscribers in this area may also have numbers from other codes if they are part of larger business networks, but the 425 code remains the standard for local fixed-line services.