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Is a wildcard CNAME DNS record valid?

Posted on August 26, 2016

Hello,

I have four subdomains. First two subdomains are set with wildcard *.static.MYSITE.com and .*v2.MYSITE.COM Another two subdomains are set without wildcard test.z3lab.info, cms.z3lab.info

Which subdomains are more correct, and why do we use wildcard?

This is my zone file

$ORIGIN z3lab.info.
$TTL 1800
z3lab.info. IN SOA ns1.digitalocean.com. hostmaster.z3lab.info. 1472229537 10800 3600 604800 1800
z3lab.info. 1800 IN NS ns1.digitalocean.com.
z3lab.info. 1800 IN NS ns2.digitalocean.com.
z3lab.info. 1800 IN NS ns3.digitalocean.com.
z3lab.info. 1800 IN A 46.101.197.231
*.static.z3lab.info. 1800 IN CNAME z3lab.info.
*.v2.z3lab.info. 1800 IN CNAME z3lab.info.
test.z3lab.info. 1800 IN CNAME z3lab.info.
cms.z3lab.info. 1800 IN CNAME z3lab.info.

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