Extstock is one of them.
I lose my 3 eth on this exchange.
Withdraw is not available.
So be careful.
Most of exchanges are not popular and not trade for them it's better to see on coinmarketcap and those you can see the popular exchanger you can start and to use, many of exchanges right now are not good if the coins not pumping up.
It is best not to trade at exchanges where the first time you hear the name, the cryptocurrency market always has many exchanges for you to choose to buy or sell. Bad exchanges, they sometimes have members sign up and deposit, they create them just for scams.