MDA - internet/dns/second-level-domain

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second-level-domain

- Domain Name [ superclass ]

Comment:: must be unique and registered with accredited companies
Comment:: there can be duplication across domains; e.g. howstuffworks.com and howstuffworks.org are completely different domains
Comment:: can be divided into further domain levels
Comment:: second-level domain name includes the top-level domain, e.g. cnn.com.

References: