Ireland phone number validator
How the phone number format works
- Format
- Ireland phone number in national or international (+353) format
- Example
- +353850123456
Things to watch for
- Accepts national or international (E.164, e.g. +353...) format
- Validated with Google's libphonenumber; confirms the number is possible/valid for this country, not that it is currently assigned or reachable
^[+]?[0-9 ()\-]{6,}$An Irish phone number splits into two families: mobiles starting with 08 (085, 086, 087, 089) followed by seven more digits, and landlines carrying a regional area code — 01 for Dublin, 021 for Cork, and so on — before a local number whose length shifts with the code. Either way, that leading 0 is a national trunk prefix: drop it the instant +353 goes on, so 087 123 4567 becomes +353871234567 internationally, not +3530871234567.
How this validator works
Paste the number as dialled at home (087 123 4567) or in full international form (+353871234567); this tool checks the digit count and the mobile or area-code prefix against Ireland’s real numbering plan using Google’s libphonenumber, entirely client-side. Because Ireland shares numbering heritage with the UK, the two are easy to cross-type — a kept leading 0 after +353, or a UK-style 07 mobile prefix instead of Ireland’s 08, are the most common ways an otherwise plausible-looking number fails here.
What a pass doesn’t tell you
A pass means the number matches a genuine Irish mobile or landline shape — it isn’t proof the SIM is active or the line connected. Irish mobile numbers get recycled once a contract lapses, so a well-formed number can easily belong to someone new.
Scope: catch a missing digit, a leftover 0 after +353, or a wrong mobile prefix before an Irish number reaches a signup form or SMS platform — not confirmation it’s reachable today.
Content last reviewed 2026-07-07.
phone number FAQ
Why does an Irish mobile number lose a digit when written as +353?
The leading 0 in 087 123 4567 is a national trunk prefix, not part of the subscriber number — it's dropped the moment +353 is added, so the correct international form is +353871234567: nine digits after the country code, not ten.
How do I know if an Irish number is a mobile or a landline?
Mobile numbers start with 08 (085, 086, 087, 089 among the ranges in use); landlines use area codes tied to a region instead — 01 for Dublin, with two- or three-digit codes elsewhere — followed by a local number of varying length.
Does a passing check mean the Irish number is currently in service?
No. It confirms the digits form a real Irish mobile or landline shape under ComReg's numbering plan — it doesn't confirm the SIM is topped up or the line connected, which only a carrier can verify.