mx52.codetel.com.do has no NS records.
NS records for this zone are defined at com.do.
NS records for this zone are defined at com.do.
Question and response
Question
dig mx52.codetel.com.do. NS
Answer
The response has no answer records.
Authority
codetel.com.do. 4223 SOA ns1.claro.net.do. hostmaster.claro.net.do. 2017030953 21600 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0