ntp3.duocast.net has no CNAME records.
Question and response
Question
dig ntp3.duocast.net. NS
Answer
The response has no answer records.
Authority
duocast.net. 1620 SOA ns1.duocast.net. hostmaster.duocast.net. 2026022401 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0