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A numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.

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In the old days, all hostname -> IP address mappings were listed in a local file /etc/hosts. But as the Internet grew (we're talking 1970's/1980's here) that didn't scale and the domain name system (D …
answered Feb 15 '19 by Darrell Root