ns.ihsystem.com has no NS records.
NS records for this zone are defined at ihsystem.com.
NS records for this zone are defined at ihsystem.com.
Question and response
Question
dig ns.ihsystem.com. NS
Answer
The response has no answer records.
Authority
ihsystem.com. 800 SOA ns1.ihsystem.com. ns2.ihsystem.com. 2026012305 172800 3600 1728000 172800
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0