Banknifty future today closed at 17452 with loss. In intraday we saw high near 17650 while low was below 17400. For tomorrow, banknifty future below 17640 remain weak and sell on rise. On downside banknifty future support zones are 17330 and 17050 while on upside 17640 is strong resistance. Future traders use 17500-17600 zone to go short with stop loss above 17640 for targets 17330 and then 17050. Option traders use banknifty 17500 put options as buy on dips.