opal4.opalstack.com has no NS records.
NS records for this zone are defined at opalstack.com.
NS records for this zone are defined at opalstack.com.
Question and response
Question
dig opal4.opalstack.com. NS
Answer
The response has no answer records.
Authority
opalstack.com. 300 SOA ns3.de.opalstack.com. hostmaster.opalstack.com. 2026031102 10800 300 1814400 300
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0