mail.ihordns.net has no NS records.
NS records for this zone are defined at ihordns.net.
NS records for this zone are defined at ihordns.net.
Question and response
Question
dig mail.ihordns.net. NS
Answer
The response has no answer records.
Authority
ihordns.net. 3600 SOA ns1.ihordns.net. tech.ihordns.net. 2019082322 3600 3600 604800 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0