Domain Names
IANA manages the DNS Root Zone (assignments of ccTLDs and gTLDs) along with other functions such as the .int and .arpa zones.
Number Resources
IANA coordinates allocations from the global IP and AS number spaces, such as those made to Regional Internet Registries.
Protocol Assignments
IANA is the central repository for protocol name and number registries used in many Internet protocols.
IANA review process. ICANN is conducting a number of reviews regarding how the IANA functions are performed. These reviews are being conducted throughout this year and we welcome feedback from the community.