ns4.wind.com.do has no CNAME records.
Question and response
Question
dig ns4.wind.com.do. NS
Answer
The response has no answer records.
Authority
wind.com.do. 3473 SOA ns2.wind.com.do. hostmaster.wind.com.do. 2011091144 7200 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0