IANA manages the DNS Root Zone (assignments of ccTLDs and gTLDs) along with other functions such as the .int and .arpa zones.
IANA coordinates allocations from the global IP and AS number spaces, such as those made to Regional Internet Registries.
IANA review process. ICANN is conducting a number of reviews regarding how the IANA functions are performed. These reviews are being conducted between late 2012 and mid-2013, and we welcome feedback from the community.