viking.sencinet.com has no CNAME records.
Question and response
Question
dig viking.sencinet.com. NS
Answer
The response has no answer records.
Authority
sencinet.com. 1800 SOA rex.ns.cloudflare.com. dns.cloudflare.com. 2397603317 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0