ns2.sinet.com.py has no CNAME records.
Question and response
Question
dig ns2.sinet.com.py. NS
Answer
The response has no answer records.
Authority
sinet.com.py. 263 SOA ns1.sinet.com.py. hostmaster.sinet.com.py. 2025049158 14400 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0