official.rotofile.com has no CNAME records.
Question and response
Question
dig official.rotofile.com. NS
Answer
The response has no answer records.
Authority
rotofile.com. 3455 SOA dns.rotofile.com. hostmaster.rotofile.com. 1166373457 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0