dev.mail.improvation.us has no NS records.
NS records for this zone are defined at improvation.us.
NS records for this zone are defined at improvation.us.
Question and response
Question
dig dev.mail.improvation.us. NS
Answer
The response has no answer records.
Authority
improvation.us. 1800 SOA michelle.ns.cloudflare.com. dns.cloudflare.com. 2397054647 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0