ns1.isi.com.do has no NS records.
NS records for this zone are defined at isi.com.do.
NS records for this zone are defined at isi.com.do.
Question and response
Question
dig ns1.isi.com.do. NS
Answer
The response has no answer records.
Authority
isi.com.do. 1800 SOA ns2.no-ip.com. hostmaster.no-ip.com. 2022064703 10800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0