ns3.o2online.de has no NS records.
NS records for this zone are defined at o2online.de.
NS records for this zone are defined at o2online.de.
Question and response
Question
dig ns3.o2online.de. NS
Answer
The response has no answer records.
Authority
o2online.de. 600 SOA ns1.o2online.de. domain-de.o2.com. 2026030500 10800 3600 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0