helium.ns.hetzner.com has no NS records.
NS records for this zone are defined at hetzner.com.
NS records for this zone are defined at hetzner.com.
Question and response
Question
dig helium.ns.hetzner.com. NS
Answer
The response has no answer records.
Authority
hetzner.com. 7200 SOA ns1.your-server.de. postmaster.your-server.de. 2026030600 14400 10800 604800 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0