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Irish numbers are not based on being "foreign born". It is only based on citizenship status.

As far as I know, those born in Northern Ireland have automatic right to Irish citizenship for being born in the island of Ireland.

https://www.citizensinformation.ie/en/moving-country/irish-c...

> The Good Friday Agreement, which was signed between the Irish and British governments in 1998, confirmed that people born in Northern Ireland could choose to be either British or Irish citizens.

> Since 1 January 2005, if you are born in Northern Ireland, you can claim Irish citizenship if your parent (or parents) are either British or Irish citizens, or one of them has lived on the island of Ireland for at least 3 out of the 4 years immediately before your birth.