dnsauth3.sys.gtei.net has no CNAME records.
Question and response
Question
dig dnsauth3.sys.gtei.net. NS
Answer
The response has no answer records.
Authority
sys.gtei.net. 1068 SOA dnsauth1.sys.gtei.net. dns.level3.net. 2011090700 3600 900 864000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0