Editing CNAME record (section)

== DNAME record ==
A '''DNAME record''' or '''Delegation Name record''' is defined by {{IETF RFC|6672}} (original RFC 2672 is now obsolete). The DNAME record provides redirection (alias) for a subtree of the domain name tree in the DNS.  That is, all names that end with a particular suffix are redirected to another part of the DNS. In contrast, the CNAME record creates an alias for a single name and not its subdomains. Like the CNAME record, the DNS lookup will continue by retrying the lookup with the new name. The name server synthesizes a CNAME record to actually apply the DNAME record to the requested name—CNAMEs for every node on a subtree have the same effect as a DNAME for the entire subtree.

For example, if there is a DNS zone as follows:
{{sxhl|2=zone|
foo.example.com.        DNAME  bar.example.com.
bar.example.com.        A      192.0.2.23
xyzzy.bar.example.com.  A      192.0.2.24
*.bar.example.com.      A      192.0.2.25
}}
An '''A''' record lookup for ''foo.example.com'' will return no data because a DNAME is not a CNAME and there is no A record directly at ''foo''.

However, a lookup for ''xyzzy.'''foo'''.example.com'' will be DNAME mapped and return the '''A''' record for ''xyzzy.'''bar'''.example.com'', which is 192.0.2.24; if the DNAME record had been a CNAME record, this request would have returned name not found.

Lastly, a request for ''foobar.foo.example.com'' would be DNAME mapped and return 192.0.2.25.