Generally whenever you create a database object it should be created by specifying SCHEMANAME.OBJECTNAME
If no object schema is explicitly specified, the schema will be set to the current authorization ID( The ID by which you have logged on).
The table will be placed in USERSPACE1 tablespace if no tablespace information is provided.
You can view this by running the query
select name,creator,tbspace from sysibm.systables where name like 'TABLENAME'