ezmail.libroabierto.net.do has no NS records.
NS records for this zone are defined at libroabierto.net.do.
NS records for this zone are defined at libroabierto.net.do.
Question and response
Question
dig ezmail.libroabierto.net.do. NS
Answer
The response has no answer records.
Authority
libroabierto.net.do. 1800 SOA carioca.ns.cloudflare.com. dns.cloudflare.com. 2398457830 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0