meaning of canonical name
1. canonical name CNAME A hosts official name as opposed to an alias. The official name is the first hostname listed for its Internet address 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. You can find a hosts canonical name using nslookup if you say set querytype=CNAME and then type a hostname.
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