The options call jan 2017 at dax is the most oi at 11800 yesterday 10881 contracts.
the next big oi is at 11500 with 7158 contracts.
10800 and 10700 the next big oi. so i thing this ist the range.http://www.eurexchange.com/exchange-en/products/idx/dax/DAX--Options/17252
Puts oi 2017 jan are at 11300 with 6388 contracts than 11000 and most at 10800 with 14,734 contracts
So this could help you for your decision for your trading plan.