mail.datacenterunited.com has no NS records.
NS records for this zone are defined at datacenterunited.com.
NS records for this zone are defined at datacenterunited.com.
Question and response
Question
dig mail.datacenterunited.com. NS
Answer
The response has no answer records.
Authority
datacenterunited.com. 1800 SOA elisabeth.ns.cloudflare.com. dns.cloudflare.com. 2398323616 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0