mail.cristoobrero.edu.do has no NS records.
NS records for this zone are defined at cristoobrero.edu.do.
NS records for this zone are defined at cristoobrero.edu.do.
Question and response
Question
dig mail.cristoobrero.edu.do. NS
Answer
The response has no answer records.
Authority
cristoobrero.edu.do. 86400 SOA ns8213.hostgator.com. root.gator4107.hostgator.com. 2026030501 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0