ftp.insude.mil.do has no NS records.
NS records for this zone are defined at insude.mil.do.
NS records for this zone are defined at insude.mil.do.
Question and response
Question
dig ftp.insude.mil.do. NS
Answer
The response has no answer records.
Authority
insude.mil.do. 1800 SOA jean.ns.cloudflare.com. dns.cloudflare.com. 2399034348 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0