I don't really see any reason why you would be looking for so much exchange carrying out IEO, are you trying to take statistics or are you creating a website that will list all of this information, if so then knowing the exchanges is just one thing but doing a thorough research about them is another, in order not to mislead investors in going to the wrong exchange that is out for their money and not their security, you can also check out latoken and bittrex, they both carry out IEO on their platforms and I think they are trusted too.