The last available tickets for the Heienken Cup quarter-final between Ulster and Saracens in April sold out on Thursday.
It means there are no tickets for the game at Ravenhill on Saturday, April 5, available for sale to the general public.
The game will be the first played in the new-look Ravenhill - although the stadium will not be officially opened unitl May 2.
Although the redeveloped Ravenhill will have a new capacity of 18,000 due to ongoing work, capacity for the European game against the English Premiership side was limited to 17,000.
There were 8,850 tickets sold to season ticket holders and Ulster supporter groups with a further 1,000 sold to new season ticket holders for 2014/15.
Saracens are entitled to 25% of tickets in all areas of the ground and they have taken their full allocation.
Ulster Rugby also confirmed 3,000 tickets have been given to ERC and contracted sponsors.
There are tickets available in the special access section for wheelchair users and essential companions. To apply please email Jennifer.email@example.com
Ulster have sold out for 11 of their 12 home games this season to date in all competitions.