mail.icss.edu.do has no NS records.
NS records for this zone are defined at icss.edu.do.
NS records for this zone are defined at icss.edu.do.
Question and response
Question
dig mail.icss.edu.do. NS
Answer
The response has no answer records.
Authority
icss.edu.do. 180 SOA ns0.dnsmadeeasy.com. dns.dnsmadeeasy.com. 2008010116 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0