CNAME (canonical name) resource record
CNAME specifies an
alias or nickname for the official, or canonical, name.
An alias should be the only record associated with the alias;
all other resource records should be
associated with the canonical name and not with the alias.
Any resource records that include a zone name as their value (for
example,
NS or MX) must list the canonical name, not the alias.
This resource record is especially useful when changing machine names. In this instance, create a CNAME record with the old name until users are accustomed to using the new name.
Here is an example of a CNAME record:
aliases {ttl} addr-class CNAME Canonical name volga-cities IN CNAME volga