In seasons were the number of teams dropped to 9 or lower, six teams qualified for the playoffs. In this case, the numbers one and two qualified for the semifinals and the other four teams played the quarterfinals. The DBL has had many rules in place to restrict the number of foreign players of clubs. This way the league seek to keep developing Dutch talent in the league. For several seasons. Until 2019, teams in the DBL were not allowed to have more than four players without a Dutch passport in their on court team at the same time. The following clubs are not competing in the DBL during the 2019–20 season, but have previously competed in the DBL for at least one season. Teams in "italics" were folded and do not exist anymore.  a: Founding member of the DBL. The two teams that advance to the Finals of the play-offs play against each other in a best-of-seven playoff format. Teams shown in "italics" are no longer in existence. Teams in bold are currently playing in the DBL.