ns3.tasc.com.tw has no CNAME records.
Question and response
Question
dig ns3.tasc.com.tw. NS
Answer
The response has no answer records.
Authority
tasc.com.tw. 3600 SOA file08.tasc.com.tw. network.tasc.com.tw. 2006050205 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0