ns3.entriso.com has no CNAME records.
Question and response
Question
dig ns3.entriso.com. NS
Answer
The response has no answer records.
Authority
entriso.com. 1113 SOA noel.ns.cloudflare.com. dns.cloudflare.com. 2398011005 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0