Each of FIBA Asia's six subzones gets one berth or two each, and FIBA Oceania gets 2 berths. The remaining 4 berths include one host nation and three for the subzones contributed by the top 3 Asian nations of the previous championship.
Allocation of berths
Subzone
Automatic Qualifier
Berths as top 3 Asian teams from last championship
The host nation and the defending champion are qualified automatically and take one berth from their own subzones, but the host also makes one extra berth for his subzone.
Participating teams
The following are the list of teams that entered the tournament.
Includes current ranking prior to the start of the tournament (in parentheses).
The draw of the preliminary round was held on 30 July 2025 at the FIBA Asia Regional Office in Beirut, Lebanon.[2]
In the preliminary round, the teams were drawn into four groups of four. The winners of each group will advance directly to the quarterfinals; the second and third teams will play the playoff match, the winner of which will also advance to the quarterfinals.
Note: Under-20/21 tourneys except FIBA Europe's are no longer held.
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Mongolia 
