mail.sensi.tools has no NS records.
NS records for this zone are defined at sensi.tools.
NS records for this zone are defined at sensi.tools.
Question and response
Question
dig mail.sensi.tools. NS
Answer
The response has no answer records.
Authority
sensi.tools. 600 SOA ns1053.ui-dns.biz. hostmaster.1und1.com. 2017060153 28800 7200 604800 600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0