mars.ns.byteopt.com has no CNAME records.
Question and response
Question
dig mars.ns.byteopt.com. NS
Answer
The response has no answer records.
Authority
byteopt.com. 46 SOA pns.speednet.bg. cpanel.speednet.bg. 2026020800 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0