mail.ihsmarkit.com has no NS records.
NS records for this zone are defined at ihsmarkit.com.
NS records for this zone are defined at ihsmarkit.com.
Question and response
Question
dig mail.ihsmarkit.com. NS
Answer
The response has no answer records.
Authority
ihsmarkit.com. 300 SOA ns1.ihsmarkit.com. hostmaster.ihsmarkit.com. 2022033198 900 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0