mx04.fischl.online has no NS records.
NS records for this zone are defined at fischl.online.
NS records for this zone are defined at fischl.online.
Question and response
Question
dig mx04.fischl.online. NS
Answer
The response has no answer records.
Authority
fischl.online. 300 SOA ns03.fischl.online. root.fischl-online.de. 1772505758 3600 7200 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0