nss1.codetel.net.do has no NS records.
NS records for this zone are defined at net.do.
NS records for this zone are defined at net.do.
Question and response
Question
dig nss1.codetel.net.do. NS
Answer
The response has no answer records.
Authority
codetel.net.do. 137 SOA ns1.claro.net.do. hostmaster.claro.net.do. 2017041241 21600 900 604800 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0