A single online entry has nabbed the entire $70 million Oz Lotto jackpot.

Lottery officials announced the news tonight on social media without revealing any other details about the winner.

The winning numbers in draw 1633 were 44, 34, 45, 1, 46, 25 and 21, with the supplementaries 9, 14 and 16.

It wasn’t known if the lucky winner or syndicate was aware of the sudden windfall, which is the second-biggest lottery prize of the year.

Millions of Australians were expected to enter tonight’s draw, the fourth biggest in Oz Lotto’s 31-year history.

Lottery officials were predicting one-in-five Australian adults would enter.

Ahead of the big draw, The Lott spokesperson Matt Hart said Oz Lotto was eagerly awaiting its fourth division one win for this year.

The last Oz Lotto $70 million draw in April was won by a 15-share Queensland syndicate, with each receiving more than $4.7 million.

It attracted a surge of late entries, with the peak of sales recorded over the last 30 minutes before the draw closed at 7.30pm.

Whether it is an individual or syndicate that scooped the cash today, the overnight millionaires will end the financial year on a high note.

There are many different ways to get help and information about gambling. You can visit the National Gambling Helpline or call on 1800 858 858.