indom20.indomco.net has no CNAME records.
Question and response
Question
dig indom20.indomco.net. NS
Answer
The response has no answer records.
Authority
indomco.net. 7200 SOA udns1.cscdns.net. hostmaster.cscdns.net. 2017092121 86400 7200 3600000 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0