SED001.amatisnetworks.com has no CNAME records.
Question and response
Question
dig SED001.amatisnetworks.com. NS
Answer
The response has no answer records.
Authority
amatisnetworks.com. 1748 SOA joan.ns.cloudflare.com. dns.cloudflare.com. 2397919843 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0