mx02.t-online.de has no NS records.
NS records for this zone are defined at t-online.de.
NS records for this zone are defined at t-online.de.
Question and response
Question
dig mx02.t-online.de. NS
Answer
The response has no answer records.
Authority
t-online.de. 3600 SOA dns00.dns.t-ipnet.de. dns.telekom.de. 2026022500 10800 1800 3024000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0