ns1.cps.com.ar has no CNAME records.
Question and response
Question
dig ns1.cps.com.ar. NS
Answer
The response has no answer records.
Authority
cps.com.ar. 9666 SOA ns1.cps.com.ar. hostmaster.cps.com.ar. 2006092982 3600 900 2419200 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0