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Computing (FOLDOC) dictionary
canonical name
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(CNAME) A host's official name as opposed to an alias. The
official name is the first hostname listed for its Internetaddress in the hostname database, /etc/hosts or the
Network Information Service (NIS) map hosts.byaddr ("hosts"
for short). A host with multiple network interfaces may have
more than one Internet address, each with its own canonical
name (and zero or more aliases).