billing.vodien.com has no CNAME records.
Question and response
Question
dig billing.vodien.com. NS
Answer
The response has no answer records.
Authority
vodien.com. 1390 SOA hope.ns.cloudflare.com. dns.cloudflare.com. 2397053172 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0