mx.agecalculator.icu has no NS records.
NS records for this zone are defined at agecalculator.icu.
NS records for this zone are defined at agecalculator.icu.
Question and response
Question
dig mx.agecalculator.icu. NS
Answer
The response has no answer records.
Authority
agecalculator.icu. 3600 SOA dns.agecalculator.icu. hostmaster.agecalculator.icu. 1571969444 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0