host149.190-138-220.telecom.net.ar has no CNAME records.
Question and response
Question
dig host149.190-138-220.telecom.net.ar. NS
Answer
The response has no answer records.
Authority
190-138-220.telecom.net.ar. 3959 SOA jazzy.arnet.com.ar. dnsmaster.arnet.net.ar. 2010010101 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0