What are the different challenges faced in the management of Internet addresses and domain name system? 

Managing DNS is not trivial. DNS is a combination of system administration and network management. Expert IT staff are needed. While DNS was designed for addressing, it's becoming overloaded. It's getting tied to applications and application protocols. The original design assumed DNS would be deeply hierarchical with high ratio of physical hosts to second-level domains. However, it's turned out to be much flatter with SOA count possibly exceeding number of physical hosts.

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