mail.affingroup.com has no NS records.
NS records for this zone are defined at affingroup.com.
NS records for this zone are defined at affingroup.com.
Question and response
Question
dig mail.affingroup.com. NS
Answer
The response has no answer records.
Authority
affingroup.com. 1800 SOA bonnie.ns.cloudflare.com. dns.cloudflare.com. 2398127961 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0