mail2.regalwork.com has no NS records.
NS records for this zone are defined at regalwork.com.
NS records for this zone are defined at regalwork.com.
Question and response
Question
dig mail2.regalwork.com. NS
Answer
The response has no answer records.
Authority
regalwork.com. 1800 SOA dana.ns.cloudflare.com. dns.cloudflare.com. 2396970008 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0