An unknown online player won €6.5m in Wednesday's Lotto jackpot - the third highest online win in the history of the game.
Last year, a Leinster syndicate won €7.1m and a man from Munster won €6.5m.
Wednesday's winning numbers were 3, 9, 17, 29, 42, 43. The bonus number was 16.
There was no winner of the Plus 1 prize of €1m or the Plus 2 prize of €250,000.
The National Lottery yesterday appealed to Wednesday's online players to check their accounts to see if they are the winner.
"What an absolutely brilliant start to the summer for a lucky online player," said National Lottery boss Dermot Griffin.
"We are asking all our online players to log into their accounts via the National Lottery website or app to see if they are the winners of this massive prize."
Meanwhile, it has emerged that three of the five players in Saturday's Winning Streak draw on the RTE game show bought their three-star tickets in Donegal.
Their win is unusual, but not a first, said a National Lottery spokesman.
"It's a rarity to get three winners from the same county, but it's not a first.
"That said, Donegal is certainly having more than its fair share of luck with the Lotto," they said.
The three Donegal players - two of whom will appear on tomorrow's Winning Streak show - are Sarah McCarron, Christopher Gillespie and Kathleen Coyle.
Sarah, who is from Clonmany, has her son to thank for her win. He gifted her some Winning Streak scratchcards for Mother's Day.
Chef Christopher bought his ticket in Carrick, Co Donegal, while living and working in Glencolmcille. He has since moved to Belfast.
Kathleen, from St Johnston, cannot make the show and will be represented by her niece's husband, Christopher Boyce.