mx1.jellyfish.systems has no NS records.
NS records for this zone are defined at jellyfish.systems.
NS records for this zone are defined at jellyfish.systems.
Question and response
Question
dig mx1.jellyfish.systems. NS
Answer
The response has no answer records.
Authority
jellyfish.systems. 3601 SOA edns.registrar-servers.com. hostmaster.registrar-servers.com. 1770826720 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0