Aren't a lot of ccTLDs and most new gTLDs nowadays hosted by a few big DNS providers? When .io was found to be vulnerable to a takeover attack a few years ago t

Aren't a lot of ccTLDs and most new gTLDs nowadays hosted by a few big DNS providers? When .io was found to be vulnerable to a takeover attack a few years ago they switched to one of those providers. I don't know which, though.