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Internet Assigned Number Authority (IANA)
Assigns parameters and keeps them from colliding
protocol numbers
IP addresses
mostly delegated to the 4 (going on 5) IP Address registries
domain names
deals with top level domains (TLDs)
rest delegated to DNS name registries
Functions split with the creation of ICANN
Internet Corporation for Assigned Names and Numbers
Independent corporation to take over IANA functions
Under contract with US government
Now IETF-IANA and non-IETF-IANA

PPT Version