mail.icamvirtual.edu.do has no NS records.
NS records for this zone are defined at icamvirtual.edu.do.
NS records for this zone are defined at icamvirtual.edu.do.
Question and response
Question
dig mail.icamvirtual.edu.do. NS
Answer
The response has no answer records.
Authority
icamvirtual.edu.do. 1800 SOA courtney.ns.cloudflare.com. dns.cloudflare.com. 2394406192 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0