I have Bittrex and BinanceUS. When I search for IOST on both the results of the search show... "no search found.. " or something similar. If I search for a coin like ADA on that same search it works as normal. My coin are on Bittrex and they show $0.00 and above that my BTC shows it current value. So damn frustrating!
I think you can ask to Binance support or decide to move your IOST to another market.
Im pretty sure the coin still alive and can be traded well.