mail.icof.edu.do has no NS records.
NS records for this zone are defined at icof.edu.do.
NS records for this zone are defined at icof.edu.do.
Question and response
Question
dig mail.icof.edu.do. NS
Answer
The response has no answer records.
Authority
icof.edu.do. 3600 SOA ns1.contabo.net. hostmaster.contabo.de. 1772962208 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0