what extent am i on?

How do I determine what extent my tablespace is currently on?

If you have DBA Studio, look at the properties of the table.

Otherwise you can try looking at DBA_SEGMENTS or DBA_TABLES.

Good luck.

well you probably really mean "What blocks is my tablespace using" Extents forms segments, segments tablespace, in other words you can have duplicate extent id in a tablespace whereas block id is unique