mail.ib.systems has no NS records.
NS records for this zone are defined at ib.systems.
NS records for this zone are defined at ib.systems.
Question and response
Question
dig mail.ib.systems. NS
Answer
The response has no answer records.
Authority
ib.systems. 1800 SOA dara.ns.cloudflare.com. dns.cloudflare.com. 2397498532 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0