Yes, phone numbers are allocated in Ireland by region. That system helps in routing calls efficiently to the various parts of the country. This means that for landline numbers, the telephone number allocation will be according to the location in which it is being used, while the network operator governs mobile numbers. This regional structure underpins the whole Irish telecommunication system a great deal so that calls can be channeled sharply according to where they are being made from and where they are actually going.
Landline Numbers and Regional Allocation
Landline telephone numbers in Ireland are Ireland Phone Number Data geographically allocated, meaning that each region of the country has a different area code allocation. It typically consists of one or two digits and is followed by the local phone number, usually consisting of seven digits.
For example:
Dublin: The area code assigned for Dublin, being the capital, is 01. Therefore, a telephone number starting with Dublin would look like this: 01 XXX XXXX.
Cork: Cork is in the south of Ireland and the area code for all numbers is 021, so a Cork number might be 021 XXX XXXX.
Galway: Galway is in the west of Ireland and uses 091 as its area code.
Waterford: Waterford is another large city and its area code is 051.
This system functions in a way that, for example, the Irish telecommunications network effectively routes calls within the country, whereby calls to certain regions would actually reach the relevant local exchange.

Mobile Numbers and Network Allocation
Unlike landline numbers, Irish mobile phone numbers are not divided geographically; that is, mobile numbers are assigned at the discretion of the network operator. Each operator is given a range of prefixes which they can use for mobile numbers independent of the region. For example:
083: Vodafone
085: Three
087: Eir
089: Tesco Mobile
These are followed by a 7-digit local number and may be dialled from anywhere in Ireland or internationally, since no regional distinction has to be made.
Conclusion
Irish telephone numbers are assigned geographically, with landline numbers having special area codes for various geographical parts of the country. Mobile numbers are assigned to a network operator, and hence, they cannot be located geographically. This system provides an efficient way of routing calls within Ireland and from other countries.