Indiana Code Title 14. Natural and Cultural Resources § 14-22-9-2

Sec. 2. (a) A person may not:

in water of the state through a hole greater than twelve (12) inches in diameter.

(b) A house, shanty, or fully enclosed structure used in ice fishing must have the name and address of the owner clearly painted or otherwise indicated on the outside of the door of the structure.  The door of the structure must be equipped with a latch of a nature that can be opened from the outside as well as from the inside.  The structure may be of a temporary nature only and shall be removed from the ice before the ice leaves.