Most cases resulted only in warning letters to property owners, though councils can issue enforcement notices or pursue fines of up to €5,000 and possible imprisonment.
Kildare County Council has investigated ten properties over suspected illegal short-term letting in the past three years - seven in 2023 and three last year.
No new cases have been opened so far in 2025.
The figures, compiled by the Irish Independent, form part of a national picture showing more than 1,600 investigations by local authorities since 2023.
Most cases resulted only in warning letters to property owners, though councils can issue enforcement notices or pursue fines of up to €5,000 and possible imprisonment.
Since July 2019, owners in Rent Pressure Zones have been required to obtain planning permission for short-term letting, unless the property is their main home or a second home rented for fewer than 90 days a year.
Despite the nationwide rules, very few planning applications have been lodged across the country.
Airbnb says most Irish hosts rent their homes for fewer than four nights a month.
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