mail.siana.edu.do has no NS records.
NS records for this zone are defined at siana.edu.do.
NS records for this zone are defined at siana.edu.do.
Question and response
Question
dig mail.siana.edu.do. NS
Answer
The response has no answer records.
Authority
siana.edu.do. 86400 SOA ns8501.hostgator.com. dnsadmin.gator4251.hostgator.com. 2026012401 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0