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NIC, ICANN: Internet Management

If every system on the network must have a unique IP address, who is ultimately assigning those addresses to institution$?$

The answer this question is the Internet Network Information Center, also known as the InterNIC.

They may be contacted at

Some of the InterNIC's previous responsabilities have been transferred to ICANN (The Internet Corporation for Assigned Names and Numbers). ICANN's responsibilities include IP address space and domain name service (DNS) management (including root DNSs).

ICANN information is at

Claude Cantin 2010-10-24